78590866792201 has 3 divisors (see below), whose sum is σ = 78590875657351. Its totient is φ = 78590857927052.

The previous prime is 78590866792187. The next prime is 78590866792213. The reversal of 78590866792201 is 10229766809587.

The square root of 78590866792201 is 8865149.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 31802257143801 + 46788609648400 = 5639349^2 + 6840220^2 .

It is not a de Polignac number, because 78590866792201 - 2²³ = 78590858403593 is a prime.

It is a super-3 number, since 3×78590866792201³ (a number of 43 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78590866792231) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 4432575 + ... + 13297723.

Almost surely, 2^{78590866792201} is an apocalyptic number.

78590866792201 is the 8865149-th square number.

78590866792201 is the 4432575-th centered octagonal number.

It is an amenable number.

78590866792201 is a deficient number, since it is larger than the sum of its proper divisors (8865150).

78590866792201 is an frugal number, since it uses more digits than its factorization.

78590866792201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17730298 (or 8865149 counting only the distinct ones).

The product of its (nonzero) digits is 182891520, while the sum is 70.

The spelling of 78590866792201 in words is "seventy-eight trillion, five hundred ninety billion, eight hundred sixty-six million, seven hundred ninety-two thousand, two hundred one".