215660229120 has 480 divisors, whose sum is σ = 861637315968. Its totient is φ = 48829169664.

The previous prime is 215660229119. The next prime is 215660229151. The reversal of 215660229120 is 21922066512.

215660229120 is a `hidden beast` number, since 2 + 1 + 5 + 6 + 602 + 29 + 1 + 20 = 666.

It is a tau number, because it is divible by the number of its divisors (480).

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

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 17250712 + ... + 17263208.

Almost surely, 2^215660229120 is an apocalyptic number.

215660229120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215660229120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (430818657984).

215660229120 is an abundant number, since it is smaller than the sum of its proper divisors (645977086848).

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

215660229120 is a wasteful number, since it uses less digits than its factorization.

215660229120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12640 (or 12621 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The spelling of 215660229120 in words is "two hundred fifteen billion, six hundred sixty million, two hundred twenty-nine thousand, one hundred twenty".