18729407933 has 4 divisors (see below), whose sum is σ = 18783383520. Its totient is φ = 18675432348.

The previous prime is 18729407923. The next prime is 18729407969. The reversal of 18729407933 is 33970492781.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 33970492781 = 23 ⋅1476977947.

It is a cyclic number.

It is not a de Polignac number, because 18729407933 - 2²⁸ = 18460972477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18729407923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26987273 + ... + 26987966.

It is an arithmetic number, because the mean of its divisors is an integer number (4695845880).

Almost surely, 2^18729407933 is an apocalyptic number.

It is an amenable number.

18729407933 is a deficient number, since it is larger than the sum of its proper divisors (53975587).

18729407933 is an equidigital number, since it uses as much as digits as its factorization.

18729407933 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53975586.

The product of its (nonzero) digits is 2286144, while the sum is 53.

The spelling of 18729407933 in words is "eighteen billion, seven hundred twenty-nine million, four hundred seven thousand, nine hundred thirty-three".