97720891497670 has 64 divisors (see below), whose sum is σ = 203254153353216. Its totient is φ = 33133449323520.

The previous prime is 97720891497623. The next prime is 97720891497683. The reversal of 97720891497670 is 7679419802779.

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, 3324775 + ... + 14369965.

It is an arithmetic number, because the mean of its divisors is an integer number (3175846146144).

Almost surely, 2^{97720891497670} is an apocalyptic number.

97720891497670 is an abundant number, since it is smaller than the sum of its proper divisors (105533261855546).

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

97720891497670 is a wasteful number, since it uses less digits than its factorization.

97720891497670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11046605.

The product of its (nonzero) digits is 672126336, while the sum is 76.

The spelling of 97720891497670 in words is "ninety-seven trillion, seven hundred twenty billion, eight hundred ninety-one million, four hundred ninety-seven thousand, six hundred seventy".