16556777407464 has 128 divisors (see below), whose sum is σ = 51441452732160. Its totient is φ = 4331911753728.

The previous prime is 16556777407453. The next prime is 16556777407493. The reversal of 16556777407464 is 46470477765561.

It is a super-2 number, since 2×16556777407464² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 78234747 + ... + 78446090.

It is an arithmetic number, because the mean of its divisors is an integer number (401886349470).

Almost surely, 2^{16556777407464} is an apocalyptic number.

16556777407464 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

16556777407464 is an abundant number, since it is smaller than the sum of its proper divisors (34884675324696).

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

16556777407464 is a wasteful number, since it uses less digits than its factorization.

16556777407464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156680907 (or 156680903 counting only the distinct ones).

The product of its (nonzero) digits is 829785600, while the sum is 69.

The spelling of 16556777407464 in words is "sixteen trillion, five hundred fifty-six billion, seven hundred seventy-seven million, four hundred seven thousand, four hundred sixty-four".