81297597357 has 24 divisors (see below), whose sum is σ = 123408400544. Its totient is φ = 51507205344.

The previous prime is 81297597349. The next prime is 81297597419. The reversal of 81297597357 is 75379579218.

81297597357 is a `hidden beast` number, since 8 + 1 + 2 + 9 + 7 + 597 + 35 + 7 = 666.

It is not a de Polignac number, because 81297597357 - 2³ = 81297597349 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 81297597294 and 81297597303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81297557357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2824483 + ... + 2853120.

Almost surely, 2^81297597357 is an apocalyptic number.

It is an amenable number.

81297597357 is a deficient number, since it is larger than the sum of its proper divisors (42110803187).

81297597357 is a wasteful number, since it uses less digits than its factorization.

81297597357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5677689 (or 5677686 counting only the distinct ones).

The product of its digits is 33339600, while the sum is 63.

The spelling of 81297597357 in words is "eighty-one billion, two hundred ninety-seven million, five hundred ninety-seven thousand, three hundred fifty-seven".