78865352677 has 2 divisors, whose sum is σ = 78865352678. Its totient is φ = 78865352676.

The previous prime is 78865352639. The next prime is 78865352723. The reversal of 78865352677 is 77625356887.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 78661177156 + 204175521 = 280466^2 + 14289^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78865352677 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78863352677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39432676338 + 39432676339.

It is an arithmetic number, because the mean of its divisors is an integer number (39432676339).

Almost surely, 2^78865352677 is an apocalyptic number.

It is an amenable number.

78865352677 is a deficient number, since it is larger than the sum of its proper divisors (1).

78865352677 is an equidigital number, since it uses as much as digits as its factorization.

78865352677 is an evil number, because the sum of its binary digits is even.

The product of its digits is 118540800, while the sum is 64.

The spelling of 78865352677 in words is "seventy-eight billion, eight hundred sixty-five million, three hundred fifty-two thousand, six hundred seventy-seven".