61131507560 has 16 divisors (see below), whose sum is σ = 137545892100. Its totient is φ = 24452603008.

The previous prime is 61131507557. The next prime is 61131507673. The reversal of 61131507560 is 6570513116.

It can be written as a sum of positive squares in 2 ways, for example, as 58161039556 + 2970468004 = 241166^2 + 54502^2 .

It is a super-2 number, since 2×61131507560² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61131507560.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 764143805 + ... + 764143884.

Almost surely, 2^61131507560 is an apocalyptic number.

It is an amenable number.

61131507560 is an abundant number, since it is smaller than the sum of its proper divisors (76414384540).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61131507560 is a wasteful number, since it uses less digits than its factorization.

61131507560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1528287700 (or 1528287696 counting only the distinct ones).

The product of its (nonzero) digits is 18900, while the sum is 35.

The spelling of 61131507560 in words is "sixty-one billion, one hundred thirty-one million, five hundred seven thousand, five hundred sixty".