16556596820780 has 24 divisors (see below), whose sum is σ = 35424869426352. Its totient is φ = 6497683280192.

The previous prime is 16556596820737. The next prime is 16556596820783. The reversal of 16556596820780 is 8702869565561.

It is a happy number.

16556596820780 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 16556596820780.

It is not an unprimeable number, because it can be changed into a prime (16556596820783) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7809714422 + ... + 7809716541.

It is an arithmetic number, because the mean of its divisors is an integer number (1476036226098).

Almost surely, 2^{16556596820780} is an apocalyptic number.

16556596820780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16556596820780 is an abundant number, since it is smaller than the sum of its proper divisors (18868272605572).

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

16556596820780 is a wasteful number, since it uses less digits than its factorization.

16556596820780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15619431025 (or 15619431023 counting only the distinct ones).

The product of its (nonzero) digits is 217728000, while the sum is 68.

The spelling of 16556596820780 in words is "sixteen trillion, five hundred fifty-six billion, five hundred ninety-six million, eight hundred twenty thousand, seven hundred eighty".