61510501660 has 24 divisors (see below), whose sum is σ = 129177177696. Its totient is φ = 24603224640.

The previous prime is 61510501643. The next prime is 61510501727. The reversal of 61510501660 is 6610501516.

61510501660 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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, 668614 + ... + 755026.

It is an arithmetic number, because the mean of its divisors is an integer number (5382382404).

Almost surely, 2^61510501660 is an apocalyptic number.

It is an amenable number.

61510501660 is an abundant number, since it is smaller than the sum of its proper divisors (67666676036).

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

61510501660 is a wasteful number, since it uses less digits than its factorization.

61510501660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122013 (or 122011 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 31.

The spelling of 61510501660 in words is "sixty-one billion, five hundred ten million, five hundred one thousand, six hundred sixty".