18856454401 has 2 divisors, whose sum is σ = 18856454402. Its totient is φ = 18856454400.

The previous prime is 18856454399. The next prime is 18856454431. The reversal of 18856454401 is 10445465881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12112103025 + 6744351376 = 110055^2 + 82124^2 .

It is a cyclic number.

It is not a de Polignac number, because 18856454401 - 2¹ = 18856454399 is a prime.

Together with 18856454399, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (18856454431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9428227200 + 9428227201.

It is an arithmetic number, because the mean of its divisors is an integer number (9428227201).

Almost surely, 2^18856454401 is an apocalyptic number.

It is an amenable number.

18856454401 is a deficient number, since it is larger than the sum of its proper divisors (1).

18856454401 is an equidigital number, since it uses as much as digits as its factorization.

18856454401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 614400, while the sum is 46.

The spelling of 18856454401 in words is "eighteen billion, eight hundred fifty-six million, four hundred fifty-four thousand, four hundred one".