61615131020 has 24 divisors (see below), whose sum is σ = 135017505504. Its totient is φ = 23574484736.

The previous prime is 61615130999. The next prime is 61615131077. The reversal of 61615131020 is 2013151616.

It is a super-2 number, since 2×61615131020² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66972509 + ... + 66973428.

It is an arithmetic number, because the mean of its divisors is an integer number (5625729396).

Almost surely, 2^61615131020 is an apocalyptic number.

It is an amenable number.

61615131020 is an abundant number, since it is smaller than the sum of its proper divisors (73402374484).

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

61615131020 is a wasteful number, since it uses less digits than its factorization.

61615131020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133945969 (or 133945967 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 26.

Adding to 61615131020 its reverse (2013151616), we get a palindrome (63628282636).

The spelling of 61615131020 in words is "sixty-one billion, six hundred fifteen million, one hundred thirty-one thousand, twenty".