61720172600 has 48 divisors (see below), whose sum is σ = 144099928800. Its totient is φ = 24584752640.

The previous prime is 61720172599. The next prime is 61720172651. The reversal of 61720172600 is 627102716.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 597809 + ... + 693408.

It is an arithmetic number, because the mean of its divisors is an integer number (3002081850).

Almost surely, 2^61720172600 is an apocalyptic number.

It is an amenable number.

61720172600 is an abundant number, since it is smaller than the sum of its proper divisors (82379756200).

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

61720172600 is a wasteful number, since it uses less digits than its factorization.

61720172600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1291472 (or 1291463 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 32.

The spelling of 61720172600 in words is "sixty-one billion, seven hundred twenty million, one hundred seventy-two thousand, six hundred".