61656511660 has 24 divisors (see below), whose sum is σ = 129484262880. Its totient is φ = 24661540224.

The previous prime is 61656511607. The next prime is 61656511669. The reversal of 61656511660 is 6611565616.

61656511660 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (61656511669) 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, 545992 + ... + 649168.

It is an arithmetic number, because the mean of its divisors is an integer number (5395177620).

Almost surely, 2^61656511660 is an apocalyptic number.

It is an amenable number.

61656511660 is an abundant number, since it is smaller than the sum of its proper divisors (67827751220).

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

61656511660 is a wasteful number, since it uses less digits than its factorization.

61656511660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133065 (or 133063 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 43.

The spelling of 61656511660 in words is "sixty-one billion, six hundred fifty-six million, five hundred eleven thousand, six hundred sixty".