18944630456 has 8 divisors (see below), whose sum is σ = 35521182120. Its totient is φ = 9472315224.

The previous prime is 18944630413. The next prime is 18944630473. The reversal of 18944630456 is 65403644981.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×18944630456² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1184039396 + ... + 1184039411.

It is an arithmetic number, because the mean of its divisors is an integer number (4440147765).

Almost surely, 2^18944630456 is an apocalyptic number.

It is an amenable number.

18944630456 is a deficient number, since it is larger than the sum of its proper divisors (16576551664).

18944630456 is a wasteful number, since it uses less digits than its factorization.

18944630456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2368078813 (or 2368078809 counting only the distinct ones).

The product of its (nonzero) digits is 2488320, while the sum is 50.

The spelling of 18944630456 in words is "eighteen billion, nine hundred forty-four million, six hundred thirty thousand, four hundred fifty-six".