15720656545 has 16 divisors (see below), whose sum is σ = 21289417920. Its totient is φ = 11038955200.

The previous prime is 15720656537. The next prime is 15720656591. The reversal of 15720656545 is 54565602751.

It is not a de Polignac number, because 15720656545 - 2³ = 15720656537 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 15720656495 and 15720656504.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4926511 + ... + 4929700.

It is an arithmetic number, because the mean of its divisors is an integer number (1330588620).

Almost surely, 2^15720656545 is an apocalyptic number.

It is an amenable number.

15720656545 is a deficient number, since it is larger than the sum of its proper divisors (5568761375).

15720656545 is a wasteful number, since it uses less digits than its factorization.

15720656545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9856256.

The product of its (nonzero) digits is 1260000, while the sum is 46.

The spelling of 15720656545 in words is "fifteen billion, seven hundred twenty million, six hundred fifty-six thousand, five hundred forty-five".