18131996258250 has 64 divisors (see below), whose sum is σ = 51722814484224. Its totient is φ = 4144456286400.

The previous prime is 18131996258249. The next prime is 18131996258267. The reversal of 18131996258250 is 5285269913181.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1726851537 + ... + 1726862036.

It is an arithmetic number, because the mean of its divisors is an integer number (808168976316).

Almost surely, 2^{18131996258250} is an apocalyptic number.

18131996258250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18131996258250 is an abundant number, since it is smaller than the sum of its proper divisors (33590818225974).

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

18131996258250 is a wasteful number, since it uses less digits than its factorization.

18131996258250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3453713600 (or 3453713590 counting only the distinct ones).

The product of its (nonzero) digits is 9331200, while the sum is 60.

The spelling of 18131996258250 in words is "eighteen trillion, one hundred thirty-one billion, nine hundred ninety-six million, two hundred fifty-eight thousand, two hundred fifty".