16530646860 has 720 divisors, whose sum is σ = 66087385056. Its totient is φ = 3427909632.

The previous prime is 16530646859. The next prime is 16530646879. The reversal of 16530646860 is 6864603561.

16530646860 is a `hidden beast` number, since 16 + 530 + 6 + 46 + 8 + 60 = 666.

It is a super-2 number, since 2×16530646860² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 239 ways as a sum of consecutive naturals, for example, 85650924 + ... + 85651116.

Almost surely, 2^16530646860 is an apocalyptic number.

16530646860 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 16530646860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33043692528).

16530646860 is an abundant number, since it is smaller than the sum of its proper divisors (49556738196).

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

16530646860 is a wasteful number, since it uses less digits than its factorization.

16530646860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324 (or 306 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 45.

The spelling of 16530646860 in words is "sixteen billion, five hundred thirty million, six hundred forty-six thousand, eight hundred sixty".