61515008457 has 32 divisors (see below), whose sum is σ = 94136884224. Its totient is φ = 35001806400.

The previous prime is 61515008431. The next prime is 61515008491. The reversal of 61515008457 is 75480051516.

It is not a de Polignac number, because 61515008457 - 2⁷ = 61515008329 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61515008497) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6090982 + ... + 6101072.

It is an arithmetic number, because the mean of its divisors is an integer number (2941777632).

Almost surely, 2^61515008457 is an apocalyptic number.

It is an amenable number.

61515008457 is a deficient number, since it is larger than the sum of its proper divisors (32621875767).

61515008457 is a wasteful number, since it uses less digits than its factorization.

61515008457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11309.

The product of its (nonzero) digits is 168000, while the sum is 42.

The spelling of 61515008457 in words is "sixty-one billion, five hundred fifteen million, eight thousand, four hundred fifty-seven".