97765656779 has 32 divisors (see below), whose sum is σ = 121930997760. Its totient is φ = 76483035648.

The previous prime is 97765656763. The next prime is 97765656787.

97765656779 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 97765656779 - 2⁴ = 97765656763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (97765656379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 529454 + ... + 689820.

It is an arithmetic number, because the mean of its divisors is an integer number (3810343680).

Almost surely, 2^97765656779 is an apocalyptic number.

97765656779 is a deficient number, since it is larger than the sum of its proper divisors (24165340981).

97765656779 is a wasteful number, since it uses less digits than its factorization.

97765656779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160547.

The product of its digits is 1050197400, while the sum is 74.

The spelling of 97765656779 in words is "ninety-seven billion, seven hundred sixty-five million, six hundred fifty-six thousand, seven hundred seventy-nine".