97621013557 has 2 divisors, whose sum is σ = 97621013558. Its totient is φ = 97621013556.

The previous prime is 97621013519. The next prime is 97621013597. The reversal of 97621013557 is 75531012679.

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., 93690475921 + 3930537636 = 306089^2 + 62694^2 .

It is a cyclic number.

It is not a de Polignac number, because 97621013557 - 2¹⁵ = 97620980789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97621013507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48810506778 + 48810506779.

It is an arithmetic number, because the mean of its divisors is an integer number (48810506779).

Almost surely, 2^97621013557 is an apocalyptic number.

It is an amenable number.

97621013557 is a deficient number, since it is larger than the sum of its proper divisors (1).

97621013557 is an equidigital number, since it uses as much as digits as its factorization.

97621013557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 396900, while the sum is 46.

The spelling of 97621013557 in words is "ninety-seven billion, six hundred twenty-one million, thirteen thousand, five hundred fifty-seven".