18919018623 has 8 divisors (see below), whose sum is σ = 25226320000. Its totient is φ = 12612198168.

The previous prime is 18919018567. The next prime is 18919018631. The reversal of 18919018623 is 32681091981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18919018623 - 2⁸ = 18919018367 is a prime.

It is a super-2 number, since 2×18919018623² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18919018823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15373 + ... + 195126.

It is an arithmetic number, because the mean of its divisors is an integer number (3153290000).

Almost surely, 2^18919018623 is an apocalyptic number.

18919018623 is a deficient number, since it is larger than the sum of its proper divisors (6307301377).

18919018623 is a wasteful number, since it uses less digits than its factorization.

18919018623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240461.

The product of its (nonzero) digits is 186624, while the sum is 48.

The spelling of 18919018623 in words is "eighteen billion, nine hundred nineteen million, eighteen thousand, six hundred twenty-three".