18929254451 has 4 divisors (see below), whose sum is σ = 19054613904. Its totient is φ = 18803895000.

The previous prime is 18929254447. The next prime is 18929254471. The reversal of 18929254451 is 15445292981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15445292981 = 283 ⋅54577007.

It is a cyclic number.

It is not a de Polignac number, because 18929254451 - 2² = 18929254447 is a prime.

It is a super-2 number, since 2×18929254451² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18929254451.

It is not an unprimeable number, because it can be changed into a prime (18929254411) 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, 62679500 + ... + 62679801.

It is an arithmetic number, because the mean of its divisors is an integer number (4763653476).

Almost surely, 2^18929254451 is an apocalyptic number.

18929254451 is a deficient number, since it is larger than the sum of its proper divisors (125359453).

18929254451 is a wasteful number, since it uses less digits than its factorization.

18929254451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125359452.

The product of its digits is 1036800, while the sum is 50.

The spelling of 18929254451 in words is "eighteen billion, nine hundred twenty-nine million, two hundred fifty-four thousand, four hundred fifty-one".