16640662187520 has 1600 divisors, whose sum is σ = 69174297561600. Its totient is φ = 3744997244928.

The previous prime is 16640662187509. The next prime is 16640662187531. The reversal of 16640662187520 is 2578126604661.

16640662187520 is a `hidden beast` number, since 1 + 6 + 6 + 4 + 0 + 6 + 621 + 8 + 7 + 5 + 2 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (16640662187509) and next prime (16640662187531).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 47680980306 + ... + 47680980654.

It is an arithmetic number, because the mean of its divisors is an integer number (43233935976).

Almost surely, 2^{16640662187520} is an apocalyptic number.

16640662187520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16640662187520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34587148780800).

16640662187520 is an abundant number, since it is smaller than the sum of its proper divisors (52533635374080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16640662187520 is a wasteful number, since it uses less digits than its factorization.

16640662187520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 805 (or 780 counting only the distinct ones).

The product of its (nonzero) digits is 5806080, while the sum is 54.

The spelling of 16640662187520 in words is "sixteen trillion, six hundred forty billion, six hundred sixty-two million, one hundred eighty-seven thousand, five hundred twenty".