18775310431 has 2 divisors, whose sum is σ = 18775310432. Its totient is φ = 18775310430.

The previous prime is 18775310381. The next prime is 18775310447. The reversal of 18775310431 is 13401357781.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18775310431 - 2¹³ = 18775302239 is a prime.

It is a super-2 number, since 2×18775310431² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18775314431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9387655215 + 9387655216.

It is an arithmetic number, because the mean of its divisors is an integer number (9387655216).

Almost surely, 2^18775310431 is an apocalyptic number.

18775310431 is a deficient number, since it is larger than the sum of its proper divisors (1).

18775310431 is an equidigital number, since it uses as much as digits as its factorization.

18775310431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 70560, while the sum is 40.

The spelling of 18775310431 in words is "eighteen billion, seven hundred seventy-five million, three hundred ten thousand, four hundred thirty-one".