215550981360 has 640 divisors, whose sum is σ = 892592870400. Its totient is φ = 47110533120.

The previous prime is 215550981307. The next prime is 215550981379. The reversal of 215550981360 is 63189055512.

215550981360 is a `hidden beast` number, since 2 + 1 + 5 + 5 + 509 + 8 + 136 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 13273726 + ... + 13289954.

It is an arithmetic number, because the mean of its divisors is an integer number (1394676360).

Almost surely, 2^215550981360 is an apocalyptic number.

215550981360 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 215550981360, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (446296435200).

215550981360 is an abundant number, since it is smaller than the sum of its proper divisors (677041889040).

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

215550981360 is a wasteful number, since it uses less digits than its factorization.

215550981360 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16318 (or 16306 counting only the distinct ones).

The product of its (nonzero) digits is 324000, while the sum is 45.

The spelling of 215550981360 in words is "two hundred fifteen billion, five hundred fifty million, nine hundred eighty-one thousand, three hundred sixty".