78851368639 has 2 divisors, whose sum is σ = 78851368640. Its totient is φ = 78851368638.

The previous prime is 78851368613. The next prime is 78851368649. The reversal of 78851368639 is 93686315887.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78851368639 - 2⁷ = 78851368511 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78851368649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39425684319 + 39425684320.

It is an arithmetic number, because the mean of its divisors is an integer number (39425684320).

Almost surely, 2^78851368639 is an apocalyptic number.

78851368639 is a deficient number, since it is larger than the sum of its proper divisors (1).

78851368639 is an equidigital number, since it uses as much as digits as its factorization.

78851368639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52254720, while the sum is 64.

The spelling of 78851368639 in words is "seventy-eight billion, eight hundred fifty-one million, three hundred sixty-eight thousand, six hundred thirty-nine".