215713566720 has 208 divisors, whose sum is σ = 766889910720. Its totient is φ = 57523470336.

The previous prime is 215713566709. The next prime is 215713566727. The reversal of 215713566720 is 27665317512.

It is a happy number.

215713566720 is a `hidden beast` number, since 2 + 1 + 5 + 7 + 13 + 566 + 72 + 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 not an unprimeable number, because it can be changed into a prime (215713566727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 357907 + ... + 748013.

Almost surely, 2^215713566720 is an apocalyptic number.

215713566720 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 215713566720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (383444955360).

215713566720 is an abundant number, since it is smaller than the sum of its proper divisors (551176344000).

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

215713566720 is an equidigital number, since it uses as much as digits as its factorization.

215713566720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390145 (or 390117 counting only the distinct ones).

The product of its (nonzero) digits is 529200, while the sum is 45.

The spelling of 215713566720 in words is "two hundred fifteen billion, seven hundred thirteen million, five hundred sixty-six thousand, seven hundred twenty".