61500565555 has 16 divisors (see below), whose sum is σ = 86702896224. Its totient is φ = 41287092480.

The previous prime is 61500565547. The next prime is 61500565561. The reversal of 61500565555 is 55556500516.

It is not a de Polignac number, because 61500565555 - 2³ = 61500565547 is a prime.

It is a Duffinian 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, 43006674 + ... + 43008103.

It is an arithmetic number, because the mean of its divisors is an integer number (5418931014).

Almost surely, 2^61500565555 is an apocalyptic number.

61500565555 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

61500565555 is a deficient number, since it is larger than the sum of its proper divisors (25202330669).

61500565555 is a wasteful number, since it uses less digits than its factorization.

61500565555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86014806.

The product of its (nonzero) digits is 562500, while the sum is 43.

The spelling of 61500565555 in words is "sixty-one billion, five hundred million, five hundred sixty-five thousand, five hundred fifty-five".