61656610051 has 8 divisors (see below), whose sum is σ = 62707725360. Its totient is φ = 60605697792.

The previous prime is 61656610033. The next prime is 61656610069. The reversal of 61656610051 is 15001665616.

It is an interprime number because it is at equal distance from previous prime (61656610033) and next prime (61656610069).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61656610051 - 2²³ = 61648221443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61656610091) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 641431 + ... + 731263.

It is an arithmetic number, because the mean of its divisors is an integer number (7838465670).

Almost surely, 2^61656610051 is an apocalyptic number.

61656610051 is a deficient number, since it is larger than the sum of its proper divisors (1051115309).

61656610051 is a wasteful number, since it uses less digits than its factorization.

61656610051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101525.

The product of its (nonzero) digits is 32400, while the sum is 37.

The spelling of 61656610051 in words is "sixty-one billion, six hundred fifty-six million, six hundred ten thousand, fifty-one".