18691959093372 has 48 divisors (see below), whose sum is σ = 48466884201120. Its totient is φ = 6229849522176.

The previous prime is 18691959093359. The next prime is 18691959093389. The reversal of 18691959093372 is 27339095919681.

18691959093372 is a `hidden beast` number, since 1 + 8 + 69 + 195 + 9 + 0 + 9 + 3 + 372 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 18691959093372.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10318213 + ... + 11993724.

It is an arithmetic number, because the mean of its divisors is an integer number (1009726754190).

Almost surely, 2^{18691959093372} is an apocalyptic number.

18691959093372 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18691959093372 is an abundant number, since it is smaller than the sum of its proper divisors (29774925107748).

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

18691959093372 is a wasteful number, since it uses less digits than its factorization.

18691959093372 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22319707 (or 22319699 counting only the distinct ones).

The product of its (nonzero) digits is 198404640, while the sum is 72.

The spelling of 18691959093372 in words is "eighteen trillion, six hundred ninety-one billion, nine hundred fifty-nine million, ninety-three thousand, three hundred seventy-two".