18518724279820 has 24 divisors (see below), whose sum is σ = 38893184460144. Its totient is φ = 7406753812416.

The previous prime is 18518724279793. The next prime is 18518724279833. The reversal of 18518724279820 is 2897242781581.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45787347 + ... + 46190026.

It is an arithmetic number, because the mean of its divisors is an integer number (1620549352506).

Almost surely, 2^{18518724279820} is an apocalyptic number.

18518724279820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18518724279820 is an abundant number, since it is smaller than the sum of its proper divisors (20374460180324).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18518724279820 is a wasteful number, since it uses less digits than its factorization.

18518724279820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91987449 (or 91987447 counting only the distinct ones).

The product of its (nonzero) digits is 36126720, while the sum is 64.

The spelling of 18518724279820 in words is "eighteen trillion, five hundred eighteen billion, seven hundred twenty-four million, two hundred seventy-nine thousand, eight hundred twenty".