16645604976 has 1080 divisors, whose sum is σ = 67797160704. Its totient is φ = 3906040320.

The previous prime is 16645604971. The next prime is 16645604981. The reversal of 16645604976 is 67940654661.

16645604976 is a `hidden beast` number, since 1 + 6 + 6 + 4 + 560 + 4 + 9 + 76 = 666.

It is an interprime number because it is at equal distance from previous prime (16645604971) and next prime (16645604981).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16645604971) by changing a digit.

It is a polite number, since it can be written in 215 ways as a sum of consecutive naturals, for example, 354161785 + ... + 354161831.

Almost surely, 2^16645604976 is an apocalyptic number.

16645604976 is a gapful number since it is divisible by the number (16) 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 16645604976, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33898580352).

16645604976 is an abundant number, since it is smaller than the sum of its proper divisors (51151555728).

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

16645604976 is a wasteful number, since it uses less digits than its factorization.

16645604976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121 (or 83 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 54.

The spelling of 16645604976 in words is "sixteen billion, six hundred forty-five million, six hundred four thousand, nine hundred seventy-six".