16358921604 has 27 divisors (see below), whose sum is σ = 41353658437. Its totient is φ = 5452718064.

The previous prime is 16358921597. The next prime is 16358921633. The reversal of 16358921604 is 40612985361.

The square root of 16358921604 is 127902.

It is a perfect power (a square), and thus also a powerful number.

16358921604 is a `hidden beast` number, since 1 + 6 + 3 + 589 + 2 + 1 + 60 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 16355852100 + 3069504 = 127890^2 + 1752^2 .

It is a super-2 number, since 2×16358921604² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16358921604.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 756754 + ... + 778070.

Almost surely, 2^16358921604 is an apocalyptic number.

16358921604 is the 127902-nd square number.

It is an amenable number.

16358921604 is an abundant number, since it is smaller than the sum of its proper divisors (24994736833).

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

16358921604 is an frugal number, since it uses more digits than its factorization.

16358921604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42644 (or 21322 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

It can be divided in two parts, 163589 and 21604, that added together give a cube (185193 = 57³).

The spelling of 16358921604 in words is "sixteen billion, three hundred fifty-eight million, nine hundred twenty-one thousand, six hundred four".