78764241025637 has 2 divisors, whose sum is σ = 78764241025638. Its totient is φ = 78764241025636.

The previous prime is 78764241025607. The next prime is 78764241025709. The reversal of 78764241025637 is 73652014246787.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72121384289761 + 6642856735876 = 8492431^2 + 2577374^2 .

It is a cyclic number.

It is not a de Polignac number, because 78764241025637 - 2⁸ = 78764241025381 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78764241025637.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78764241025607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39382120512818 + 39382120512819.

It is an arithmetic number, because the mean of its divisors is an integer number (39382120512819).

Almost surely, 2^{78764241025637} is an apocalyptic number.

It is an amenable number.

78764241025637 is a deficient number, since it is larger than the sum of its proper divisors (1).

78764241025637 is an equidigital number, since it uses as much as digits as its factorization.

78764241025637 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 94832640, while the sum is 62.

The spelling of 78764241025637 in words is "seventy-eight trillion, seven hundred sixty-four billion, two hundred forty-one million, twenty-five thousand, six hundred thirty-seven".