16556808774 has 16 divisors (see below), whose sum is σ = 36123946560. Its totient is φ = 5017214760.

The previous prime is 16556808767. The next prime is 16556808809. The reversal of 16556808774 is 47780865561.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125430304 + ... + 125430435.

It is an arithmetic number, because the mean of its divisors is an integer number (2257746660).

Almost surely, 2^16556808774 is an apocalyptic number.

16556808774 is an abundant number, since it is smaller than the sum of its proper divisors (19567137786).

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

16556808774 is a wasteful number, since it uses less digits than its factorization.

16556808774 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250860755.

The product of its (nonzero) digits is 11289600, while the sum is 57.

The spelling of 16556808774 in words is "sixteen billion, five hundred fifty-six million, eight hundred eight thousand, seven hundred seventy-four".