97565656578 has 16 divisors (see below), whose sum is σ = 210141414336. Its totient is φ = 30020202000.

The previous prime is 97565656511. The next prime is 97565656589. The reversal of 97565656578 is 87565656579.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 625420798 + ... + 625420953.

It is an arithmetic number, because the mean of its divisors is an integer number (13133838396).

Almost surely, 2^97565656578 is an apocalyptic number.

97565656578 is an abundant number, since it is smaller than the sum of its proper divisors (112575757758).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

97565656578 is a wasteful number, since it uses less digits than its factorization.

97565656578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1250841769.

The product of its digits is 476280000, while the sum is 69.

Subtracting from 97565656578 its reverse (87565656579), we obtain a palindrome (9999999999).

The spelling of 97565656578 in words is "ninety-seven billion, five hundred sixty-five million, six hundred fifty-six thousand, five hundred seventy-eight".