18729691723 has 2 divisors, whose sum is σ = 18729691724. Its totient is φ = 18729691722.

The previous prime is 18729691711. The next prime is 18729691751. The reversal of 18729691723 is 32719692781.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18729691723 - 2⁵ = 18729691691 is a prime.

It is a super-2 number, since 2×18729691723² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (18729611723) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9364845861 + 9364845862.

It is an arithmetic number, because the mean of its divisors is an integer number (9364845862).

Almost surely, 2^18729691723 is an apocalyptic number.

18729691723 is a deficient number, since it is larger than the sum of its proper divisors (1).

18729691723 is an equidigital number, since it uses as much as digits as its factorization.

18729691723 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2286144, while the sum is 55.

The spelling of 18729691723 in words is "eighteen billion, seven hundred twenty-nine million, six hundred ninety-one thousand, seven hundred twenty-three".