78022754636401 has 3 divisors (see below), whose sum is σ = 78022763469451. Its totient is φ = 78022745803352.

The previous prime is 78022754636399. The next prime is 78022754636419. The reversal of 78022754636401 is 10463645722087.

The square root of 78022754636401 is 8833049.

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., 77176207430001 + 846547206400 = 8784999^2 + 920080^2 .

It is not a de Polignac number, because 78022754636401 - 2¹ = 78022754636399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78022754636201) 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, 4416525 + ... + 13249573.

Almost surely, 2^{78022754636401} is an apocalyptic number.

78022754636401 is the 8833049-th square number.

78022754636401 is the 4416525-th centered octagonal number.

It is an amenable number.

78022754636401 is a deficient number, since it is larger than the sum of its proper divisors (8833050).

78022754636401 is an frugal number, since it uses more digits than its factorization.

78022754636401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17666098 (or 8833049 counting only the distinct ones).

The product of its (nonzero) digits is 13547520, while the sum is 55.

The spelling of 78022754636401 in words is "seventy-eight trillion, twenty-two billion, seven hundred fifty-four million, six hundred thirty-six thousand, four hundred one".