97765785191 has 2 divisors, whose sum is σ = 97765785192. Its totient is φ = 97765785190.

The previous prime is 97765785157. The next prime is 97765785233. The reversal of 97765785191 is 19158756779.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 97765785191 - 2⁶ = 97765785127 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97765785991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48882892595 + 48882892596.

It is an arithmetic number, because the mean of its divisors is an integer number (48882892596).

Almost surely, 2^97765785191 is an apocalyptic number.

97765785191 is a deficient number, since it is larger than the sum of its proper divisors (1).

97765785191 is an equidigital number, since it uses as much as digits as its factorization.

97765785191 is an evil number, because the sum of its binary digits is even.

The product of its digits is 33339600, while the sum is 65.

The spelling of 97765785191 in words is "ninety-seven billion, seven hundred sixty-five million, seven hundred eighty-five thousand, one hundred ninety-one".