61720698682968 has 128 divisors (see below), whose sum is σ = 166257502387200. Its totient is φ = 18981114393600.

The previous prime is 61720698682939. The next prime is 61720698683009. The reversal of 61720698682968 is 86928689602716.

It is a happy number.

It is a Smith number, since the sum of its digits (78) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (78).

It is a junction number, because it is equal to n+sod(n) for n = 61720698682893 and 61720698682902.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8853919723 + ... + 8853926693.

It is an arithmetic number, because the mean of its divisors is an integer number (1298886737400).

Almost surely, 2^{61720698682968} is an apocalyptic number.

It is an amenable number.

61720698682968 is an abundant number, since it is smaller than the sum of its proper divisors (104536803704232).

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

61720698682968 is a wasteful number, since it uses less digits than its factorization.

61720698682968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17673 (or 17669 counting only the distinct ones).

The product of its (nonzero) digits is 1504935936, while the sum is 78.

The spelling of 61720698682968 in words is "sixty-one trillion, seven hundred twenty billion, six hundred ninety-eight million, six hundred eighty-two thousand, nine hundred sixty-eight".