18867926401 has 2 divisors, whose sum is σ = 18867926402. Its totient is φ = 18867926400.

The previous prime is 18867926393. The next prime is 18867926419. The reversal of 18867926401 is 10462976881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18229050225 + 638876176 = 135015^2 + 25276^2 .

It is a cyclic number.

It is not a de Polignac number, because 18867926401 - 2³ = 18867926393 is a prime.

It is not a weakly prime, because it can be changed into another prime (18867926431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9433963200 + 9433963201.

It is an arithmetic number, because the mean of its divisors is an integer number (9433963201).

Almost surely, 2^18867926401 is an apocalyptic number.

It is an amenable number.

18867926401 is a deficient number, since it is larger than the sum of its proper divisors (1).

18867926401 is an equidigital number, since it uses as much as digits as its factorization.

18867926401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1161216, while the sum is 52.

The spelling of 18867926401 in words is "eighteen billion, eight hundred sixty-seven million, nine hundred twenty-six thousand, four hundred one".