15660405064 has 8 divisors (see below), whose sum is σ = 29363259510. Its totient is φ = 7830202528.

The previous prime is 15660405041. The next prime is 15660405107. The reversal of 15660405064 is 46050406651.

15660405064 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 7946296164 + 7714108900 = 89142^2 + 87830^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 978775309 + ... + 978775324.

Almost surely, 2^15660405064 is an apocalyptic number.

It is an amenable number.

15660405064 is a deficient number, since it is larger than the sum of its proper divisors (13702854446).

15660405064 is a wasteful number, since it uses less digits than its factorization.

15660405064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1957550639 (or 1957550635 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 37.

The spelling of 15660405064 in words is "fifteen billion, six hundred sixty million, four hundred five thousand, sixty-four".