18855376457 has 2 divisors, whose sum is σ = 18855376458. Its totient is φ = 18855376456.

The previous prime is 18855376433. The next prime is 18855376607. The reversal of 18855376457 is 75467355881.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16636872256 + 2218504201 = 128984^2 + 47101^2 .

It is a cyclic number.

It is not a de Polignac number, because 18855376457 - 2²⁸ = 18586941001 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18855376396 and 18855376405.

It is not a weakly prime, because it can be changed into another prime (18855373457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9427688228 + 9427688229.

It is an arithmetic number, because the mean of its divisors is an integer number (9427688229).

Almost surely, 2^18855376457 is an apocalyptic number.

It is an amenable number.

18855376457 is a deficient number, since it is larger than the sum of its proper divisors (1).

18855376457 is an equidigital number, since it uses as much as digits as its factorization.

18855376457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28224000, while the sum is 59.

The spelling of 18855376457 in words is "eighteen billion, eight hundred fifty-five million, three hundred seventy-six thousand, four hundred fifty-seven".