97990041557 has 2 divisors, whose sum is σ = 97990041558. Its totient is φ = 97990041556.

The previous prime is 97990041553. The next prime is 97990041607. The reversal of 97990041557 is 75514009979.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 93872380996 + 4117660561 = 306386^2 + 64169^2 .

It is a cyclic number.

It is not a de Polignac number, because 97990041557 - 2² = 97990041553 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97990041551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48995020778 + 48995020779.

It is an arithmetic number, because the mean of its divisors is an integer number (48995020779).

Almost surely, 2^97990041557 is an apocalyptic number.

It is an amenable number.

97990041557 is a deficient number, since it is larger than the sum of its proper divisors (1).

97990041557 is an equidigital number, since it uses as much as digits as its factorization.

97990041557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3572100, while the sum is 56.

The spelling of 97990041557 in words is "ninety-seven billion, nine hundred ninety million, forty-one thousand, five hundred fifty-seven".