16646157440 has 256 divisors, whose sum is σ = 44990225280. Its totient is φ = 5836800000.

The previous prime is 16646157401. The next prime is 16646157443. The reversal of 16646157440 is 4475164661.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 16646157391 and 16646157400.

It is not an unprimeable number, because it can be changed into a prime (16646157443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29152355 + ... + 29152925.

Almost surely, 2^16646157440 is an apocalyptic number.

16646157440 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 16646157440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22495112640).

16646157440 is an abundant number, since it is smaller than the sum of its proper divisors (28344067840).

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

16646157440 is a wasteful number, since it uses less digits than its factorization.

16646157440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 743 (or 731 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 44.

The spelling of 16646157440 in words is "sixteen billion, six hundred forty-six million, one hundred fifty-seven thousand, four hundred forty".