78515935387 has 2 divisors, whose sum is σ = 78515935388. Its totient is φ = 78515935386.

The previous prime is 78515935373. The next prime is 78515935391. The reversal of 78515935387 is 78353951587.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78515935387 is a prime.

It is not a weakly prime, because it can be changed into another prime (78515935307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39257967693 + 39257967694.

It is an arithmetic number, because the mean of its divisors is an integer number (39257967694).

Almost surely, 2^78515935387 is an apocalyptic number.

78515935387 is a deficient number, since it is larger than the sum of its proper divisors (1).

78515935387 is an equidigital number, since it uses as much as digits as its factorization.

78515935387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31752000, while the sum is 61.

The spelling of 78515935387 in words is "seventy-eight billion, five hundred fifteen million, nine hundred thirty-five thousand, three hundred eighty-seven".