18661205488 has 20 divisors (see below), whose sum is σ = 36202051720. Its totient is φ = 9318740544.

The previous prime is 18661205467. The next prime is 18661205513. The reversal of 18661205488 is 88450216681.

It is a super-2 number, since 2×18661205488² (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 in 3 ways as a sum of consecutive naturals, for example, 728403 + ... + 753586.

It is an arithmetic number, because the mean of its divisors is an integer number (1810102586).

Almost surely, 2^18661205488 is an apocalyptic number.

It is an amenable number.

18661205488 is a deficient number, since it is larger than the sum of its proper divisors (17540846232).

18661205488 is a wasteful number, since it uses less digits than its factorization.

18661205488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1482784 (or 1482778 counting only the distinct ones).

The product of its (nonzero) digits is 737280, while the sum is 49.

The spelling of 18661205488 in words is "eighteen billion, six hundred sixty-one million, two hundred five thousand, four hundred eighty-eight".