16621434456 has 32 divisors (see below), whose sum is σ = 45331185600. Its totient is φ = 5036798240.

The previous prime is 16621434433. The next prime is 16621434461. The reversal of 16621434456 is 65443412661.

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, 31479726 + ... + 31480253.

It is an arithmetic number, because the mean of its divisors is an integer number (1416599550).

Almost surely, 2^16621434456 is an apocalyptic number.

It is an amenable number.

16621434456 is an abundant number, since it is smaller than the sum of its proper divisors (28709751144).

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

16621434456 is a wasteful number, since it uses less digits than its factorization.

16621434456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62959999 (or 62959995 counting only the distinct ones).

The product of its digits is 414720, while the sum is 42.

The spelling of 16621434456 in words is "sixteen billion, six hundred twenty-one million, four hundred thirty-four thousand, four hundred fifty-six".