97073987991557 has 2 divisors, whose sum is σ = 97073987991558. Its totient is φ = 97073987991556.

The previous prime is 97073987991527. The next prime is 97073987991599. The reversal of 97073987991557 is 75519978937079.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87811911381601 + 9262076609956 = 9370801^2 + 3043366^2 .

It is a cyclic number.

It is not a de Polignac number, because 97073987991557 - 2⁸ = 97073987991301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97073987991527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48536993995778 + 48536993995779.

It is an arithmetic number, because the mean of its divisors is an integer number (48536993995779).

Almost surely, 2^{97073987991557} is an apocalyptic number.

It is an amenable number.

97073987991557 is a deficient number, since it is larger than the sum of its proper divisors (1).

97073987991557 is an equidigital number, since it uses as much as digits as its factorization.

97073987991557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9451776600, while the sum is 86.

The spelling of 97073987991557 in words is "ninety-seven trillion, seventy-three billion, nine hundred eighty-seven million, nine hundred ninety-one thousand, five hundred fifty-seven".