16661296512 has 256 divisors, whose sum is σ = 56583398400. Its totient is φ = 4727808000.

The previous prime is 16661296499. The next prime is 16661296523. The reversal of 16661296512 is 21569216661.

It is a super-2 number, since 2×16661296512² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3650712 + ... + 3655272.

It is an arithmetic number, because the mean of its divisors is an integer number (221028900).

Almost surely, 2^16661296512 is an apocalyptic number.

16661296512 is a gapful number since it is divisible by the number (12) 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 16661296512, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28291699200).

16661296512 is an abundant number, since it is smaller than the sum of its proper divisors (39922101888).

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

16661296512 is a wasteful number, since it uses less digits than its factorization.

16661296512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4742 (or 4724 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The spelling of 16661296512 in words is "sixteen billion, six hundred sixty-one million, two hundred ninety-six thousand, five hundred twelve".