16172521604 has 12 divisors (see below), whose sum is σ = 28336902300. Its totient is φ = 8076263808.

The previous prime is 16172521567. The next prime is 16172521613. The reversal of 16172521604 is 40612527161.

It can be written as a sum of positive squares in 2 ways, for example, as 9062659204 + 7109862400 = 95198^2 + 84320^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2495609 + ... + 2502080.

It is an arithmetic number, because the mean of its divisors is an integer number (2361408525).

Almost surely, 2^16172521604 is an apocalyptic number.

It is an amenable number.

16172521604 is a deficient number, since it is larger than the sum of its proper divisors (12164380696).

16172521604 is a wasteful number, since it uses less digits than its factorization.

16172521604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4998502 (or 4998500 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 35.

The spelling of 16172521604 in words is "sixteen billion, one hundred seventy-two million, five hundred twenty-one thousand, six hundred four".