61571139057 has 12 divisors (see below), whose sum is σ = 88989784260. Its totient is φ = 41022643968.

The previous prime is 61571139037. The next prime is 61571139061. The reversal of 61571139057 is 75093117516.

61571139057 is a `hidden beast` number, since 61 + 571 + 13 + 9 + 0 + 5 + 7 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 6078385296 + 55492753761 = 77964^2 + 235569^2 .

It is not a de Polignac number, because 61571139057 - 2⁷ = 61571138929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61571139037) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2049432 + ... + 2079257.

It is an arithmetic number, because the mean of its divisors is an integer number (7415815355).

Almost surely, 2^61571139057 is an apocalyptic number.

It is an amenable number.

61571139057 is a deficient number, since it is larger than the sum of its proper divisors (27418645203).

61571139057 is a wasteful number, since it uses less digits than its factorization.

61571139057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4130352 (or 4130349 counting only the distinct ones).

The product of its (nonzero) digits is 198450, while the sum is 45.

The spelling of 61571139057 in words is "sixty-one billion, five hundred seventy-one million, one hundred thirty-nine thousand, fifty-seven".