15421450564 has 12 divisors (see below), whose sum is σ = 29063503084. Its totient is φ = 7117592544.

The previous prime is 15421450549. The next prime is 15421450661. The reversal of 15421450564 is 46505412451.

It can be written as a sum of positive squares in 2 ways, for example, as 6014002500 + 9407448064 = 77550^2 + 96992^2 .

It is a super-2 number, since 2×15421450564² (a number of 21 digits) contains 22 as substring.

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, 148283127 + ... + 148283230.

Almost surely, 2^15421450564 is an apocalyptic number.

It is an amenable number.

15421450564 is a deficient number, since it is larger than the sum of its proper divisors (13642052520).

15421450564 is a wasteful number, since it uses less digits than its factorization.

15421450564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296566374 (or 296566372 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 37.

The spelling of 15421450564 in words is "fifteen billion, four hundred twenty-one million, four hundred fifty thousand, five hundred sixty-four".