61137528561 has 24 divisors (see below), whose sum is σ = 88848264960. Its totient is φ = 40510500000.

The previous prime is 61137528511. The next prime is 61137528623. The reversal of 61137528561 is 16582573116.

61137528561 is a `hidden beast` number, since 6 + 1 + 1 + 37 + 52 + 8 + 561 = 666.

61137528561 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 61137528561 - 2⁷ = 61137528433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61137528511) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1053811 + ... + 1110311.

It is an arithmetic number, because the mean of its divisors is an integer number (3702011040).

Almost surely, 2^61137528561 is an apocalyptic number.

It is an amenable number.

61137528561 is a deficient number, since it is larger than the sum of its proper divisors (27710736399).

61137528561 is a wasteful number, since it uses less digits than its factorization.

61137528561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57237 (or 57234 counting only the distinct ones).

The product of its digits is 302400, while the sum is 45.

It can be divided in two parts, 611375 and 28561, that added together give a palindrome (639936).

The spelling of 61137528561 in words is "sixty-one billion, one hundred thirty-seven million, five hundred twenty-eight thousand, five hundred sixty-one".