56501515565 has 16 divisors (see below), whose sum is σ = 74120071680. Its totient is φ = 41006205120.

The previous prime is 56501515531. The next prime is 56501515583. The reversal of 56501515565 is 56551510565.

56501515565 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 56501515565 - 2¹⁰ = 56501514541 is a prime.

It is a super-2 number, since 2×56501515565² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

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, 1045994 + ... + 1098683.

It is an arithmetic number, because the mean of its divisors is an integer number (4632504480).

Almost surely, 2^56501515565 is an apocalyptic number.

56501515565 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

56501515565 is a deficient number, since it is larger than the sum of its proper divisors (17618556115).

56501515565 is a wasteful number, since it uses less digits than its factorization.

56501515565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2145172.

The product of its (nonzero) digits is 562500, while the sum is 44.

Subtracting 56501515565 from its reverse (56551510565), we obtain a triangular number (49995000 = T₉₉₉₉).

The spelling of 56501515565 in words is "fifty-six billion, five hundred one million, five hundred fifteen thousand, five hundred sixty-five".