18634691723 has 2 divisors, whose sum is σ = 18634691724. Its totient is φ = 18634691722.

The previous prime is 18634691651. The next prime is 18634691771. The reversal of 18634691723 is 32719643681.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 18634691723 - 2³⁴ = 1454822539 is a prime.

It is a super-2 number, since 2×18634691723² (a number of 21 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (18634691783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9317345861 + 9317345862.

It is an arithmetic number, because the mean of its divisors is an integer number (9317345862).

Almost surely, 2^18634691723 is an apocalyptic number.

18634691723 is a deficient number, since it is larger than the sum of its proper divisors (1).

18634691723 is an equidigital number, since it uses as much as digits as its factorization.

18634691723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 50.

The spelling of 18634691723 in words is "eighteen billion, six hundred thirty-four million, six hundred ninety-one thousand, seven hundred twenty-three".