18122178623 has 2 divisors, whose sum is σ = 18122178624. Its totient is φ = 18122178622.

The previous prime is 18122178601. The next prime is 18122178667. The reversal of 18122178623 is 32687122181.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18122178623 - 2⁸ = 18122178367 is a prime.

It is a super-2 number, since 2×18122178623² (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 (18122178673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9061089311 + 9061089312.

It is an arithmetic number, because the mean of its divisors is an integer number (9061089312).

Almost surely, 2^18122178623 is an apocalyptic number.

18122178623 is a deficient number, since it is larger than the sum of its proper divisors (1).

18122178623 is an equidigital number, since it uses as much as digits as its factorization.

18122178623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64512, while the sum is 41.

The spelling of 18122178623 in words is "eighteen billion, one hundred twenty-two million, one hundred seventy-eight thousand, six hundred twenty-three".