61664402500 has 60 divisors (see below), whose sum is σ = 135013032000. Its totient is φ = 24635524000.

The previous prime is 61664402419. The next prime is 61664402521. The reversal of 61664402500 is 520446616.

61664402500 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2082801 + ... + 2112199.

It is an arithmetic number, because the mean of its divisors is an integer number (2250217200).

Almost surely, 2^61664402500 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61664402500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67506516000).

61664402500 is an abundant number, since it is smaller than the sum of its proper divisors (73348629500).

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

61664402500 is a wasteful number, since it uses less digits than its factorization.

61664402500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30262 (or 30245 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 34.

The spelling of 61664402500 in words is "sixty-one billion, six hundred sixty-four million, four hundred two thousand, five hundred".