78804662085601 has 27 divisors (see below), whose sum is σ = 84614819805201. Its totient is φ = 73382406796008.

The previous prime is 78804662085593. The next prime is 78804662085637. The reversal of 78804662085601 is 10658026640887.

The square root of 78804662085601 is 8877199.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 78804662085601 - 2³ = 78804662085593 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78804662085601.

It is not an unprimeable number, because it can be changed into a prime (78804662085641) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 9951336120 + ... + 9951344038.

Almost surely, 2^{78804662085601} is an apocalyptic number.

78804662085601 is the 8877199-th square number.

78804662085601 is the 4438600-th centered octagonal number.

It is an amenable number.

78804662085601 is a deficient number, since it is larger than the sum of its proper divisors (5810157719600).

78804662085601 is an frugal number, since it uses more digits than its factorization.

78804662085601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15994 (or 7997 counting only the distinct ones).

The product of its (nonzero) digits is 30965760, while the sum is 61.

The spelling of 78804662085601 in words is "seventy-eight trillion, eight hundred four billion, six hundred sixty-two million, eighty-five thousand, six hundred one".