866790401 has 2 divisors, whose sum is σ = 866790402. Its totient is φ = 866790400.

The previous prime is 866790371. The next prime is 866790413. The reversal of 866790401 is 104097668.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 864418801 + 2371600 = 29401^2 + 1540^2 .

It is a cyclic number.

It is not a de Polignac number, because 866790401 - 2²⁶ = 799681537 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (866730401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433395200 + 433395201.

It is an arithmetic number, because the mean of its divisors is an integer number (433395201).

Almost surely, 2^866790401 is an apocalyptic number.

It is an amenable number.

866790401 is a deficient number, since it is larger than the sum of its proper divisors (1).

866790401 is an equidigital number, since it uses as much as digits as its factorization.

866790401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 866790401 is about 29441.3043359156. The cubic root of 866790401 is about 953.4648731916.

The spelling of 866790401 in words is "eight hundred sixty-six million, seven hundred ninety thousand, four hundred one".