20151791152218 has 96 divisors (see below), whose sum is σ = 48962425217472. Its totient is φ = 5936266828800.

The previous prime is 20151791152201. The next prime is 20151791152249. The reversal of 20151791152218 is 81225119715102.

20151791152218 is a `hidden beast` number, since 2 + 0 + 1 + 51 + 79 + 1 + 1 + 522 + 1 + 8 = 666.

It is a super-2 number, since 2×20151791152218² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7002378 + ... + 9451818.

It is an arithmetic number, because the mean of its divisors is an integer number (510025262682).

Almost surely, 2^{20151791152218} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20151791152218, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24481212608736).

20151791152218 is an abundant number, since it is smaller than the sum of its proper divisors (28810634065254).

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

20151791152218 is a wasteful number, since it uses less digits than its factorization.

20151791152218 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2450620 (or 2450617 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 45.

The spelling of 20151791152218 in words is "twenty trillion, one hundred fifty-one billion, seven hundred ninety-one million, one hundred fifty-two thousand, two hundred eighteen".