55615661565 has 32 divisors (see below), whose sum is σ = 91378077696. Its totient is φ = 28872829440.

The previous prime is 55615661533. The next prime is 55615661581. The reversal of 55615661565 is 56516651655.

It is not a de Polignac number, because 55615661565 - 2⁵ = 55615661533 is a prime.

It is a super-2 number, since 2×55615661565² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 174456 + ... + 376385.

It is an arithmetic number, because the mean of its divisors is an integer number (2855564928).

Almost surely, 2^55615661565 is an apocalyptic number.

It is an amenable number.

55615661565 is a deficient number, since it is larger than the sum of its proper divisors (35762416131).

55615661565 is a wasteful number, since it uses less digits than its factorization.

55615661565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551029.

The product of its digits is 4050000, while the sum is 51.

The spelling of 55615661565 in words is "fifty-five billion, six hundred fifteen million, six hundred sixty-one thousand, five hundred sixty-five".