215901481104 has 75 divisors (see below), whose sum is σ = 624929942307. Its totient is φ = 71961584544.

The previous prime is 215901481069. The next prime is 215901481109. The reversal of 215901481104 is 401184109512.

The square root of 215901481104 is 464652.

It is a perfect power (a square), and thus also a powerful number.

215901481104 is a `hidden beast` number, since 21 + 59 + 0 + 1 + 481 + 104 = 666.

It is a super-2 number, since 2×215901481104² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (215901481109) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 16721019 + ... + 16733925.

Almost surely, 2^215901481104 is an apocalyptic number.

215901481104 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

215901481104 is the 464652-nd square number.

It is an amenable number.

215901481104 is an abundant number, since it is smaller than the sum of its proper divisors (409028461203).

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

215901481104 is an frugal number, since it uses more digits than its factorization.

215901481104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25834 (or 12912 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

Multiplying 215901481104 by its sum of digits (36), we get a square (7772453319744 = 2787912²).

215901481104 divided by its sum of digits (36) gives a square (5997263364 = 77442²).

The spelling of 215901481104 in words is "two hundred fifteen billion, nine hundred one million, four hundred eighty-one thousand, one hundred four".