78695978527 has 2 divisors, whose sum is σ = 78695978528. Its totient is φ = 78695978526.

The previous prime is 78695978447. The next prime is 78695978561. The reversal of 78695978527 is 72587959687.

It is a strong prime.

It is an emirp because it is prime and its reverse (72587959687) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78695978527 - 2³¹ = 76548494879 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78695978527.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78695978567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39347989263 + 39347989264.

It is an arithmetic number, because the mean of its divisors is an integer number (39347989264).

Almost surely, 2^78695978527 is an apocalyptic number.

78695978527 is a deficient number, since it is larger than the sum of its proper divisors (1).

78695978527 is an equidigital number, since it uses as much as digits as its factorization.

78695978527 is an evil number, because the sum of its binary digits is even.

The product of its digits is 533433600, while the sum is 73.

The spelling of 78695978527 in words is "seventy-eight billion, six hundred ninety-five million, nine hundred seventy-eight thousand, five hundred twenty-seven".