18420551164 has 12 divisors (see below), whose sum is σ = 32237905000. Its totient is φ = 9209721168.

The previous prime is 18420551159. The next prime is 18420551197. The reversal of 18420551164 is 46115502481.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 58734 + ... + 200725.

Almost surely, 2^18420551164 is an apocalyptic number.

It is an amenable number.

18420551164 is a deficient number, since it is larger than the sum of its proper divisors (13817353836).

18420551164 is a wasteful number, since it uses less digits than its factorization.

18420551164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277212 (or 277210 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 37.

The spelling of 18420551164 in words is "eighteen billion, four hundred twenty million, five hundred fifty-one thousand, one hundred sixty-four".