18814454881 has 2 divisors, whose sum is σ = 18814454882. Its totient is φ = 18814454880.

The previous prime is 18814454839. The next prime is 18814454887. The reversal of 18814454881 is 18845441881.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17397610000 + 1416844881 = 131900^2 + 37641^2 .

It is a cyclic number.

It is not a de Polignac number, because 18814454881 - 2⁷ = 18814454753 is a prime.

It is a super-2 number, since 2×18814454881² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18814454887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9407227440 + 9407227441.

It is an arithmetic number, because the mean of its divisors is an integer number (9407227441).

Almost surely, 2^18814454881 is an apocalyptic number.

It is an amenable number.

18814454881 is a deficient number, since it is larger than the sum of its proper divisors (1).

18814454881 is an equidigital number, since it uses as much as digits as its factorization.

18814454881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1310720, while the sum is 52.

The spelling of 18814454881 in words is "eighteen billion, eight hundred fourteen million, four hundred fifty-four thousand, eight hundred eighty-one".