97639493669 has 2 divisors, whose sum is σ = 97639493670. Its totient is φ = 97639493668.

The previous prime is 97639493599. The next prime is 97639493681. The reversal of 97639493669 is 96639493679.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 88964992900 + 8674500769 = 298270^2 + 93137^2 .

It is a cyclic number.

It is not a de Polignac number, because 97639493669 - 2¹² = 97639489573 is a prime.

It is a super-2 number, since 2×97639493669² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97639493069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48819746834 + 48819746835.

It is an arithmetic number, because the mean of its divisors is an integer number (48819746835).

Almost surely, 2^97639493669 is an apocalyptic number.

It is an amenable number.

97639493669 is a deficient number, since it is larger than the sum of its proper divisors (1).

97639493669 is an equidigital number, since it uses as much as digits as its factorization.

97639493669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 357128352, while the sum is 71.

The spelling of 97639493669 in words is "ninety-seven billion, six hundred thirty-nine million, four hundred ninety-three thousand, six hundred sixty-nine".