215815253472 has 576 divisors, whose sum is σ = 791682776640. Its totient is φ = 56692887552.

The previous prime is 215815253471. The next prime is 215815253519. The reversal of 215815253472 is 274352518512.

215815253472 is a `hidden beast` number, since 2 + 1 + 5 + 81 + 52 + 53 + 472 = 666.

Its product of digits (672000) is a multiple of the sum of its prime factors (1600).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215815253471) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 174466038 + ... + 174467274.

It is an arithmetic number, because the mean of its divisors is an integer number (1374449265).

Almost surely, 2^215815253472 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215815253472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (395841388320).

215815253472 is an abundant number, since it is smaller than the sum of its proper divisors (575867523168).

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

215815253472 is a wasteful number, since it uses less digits than its factorization.

215815253472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1600 (or 1579 counting only the distinct ones).

The product of its digits is 672000, while the sum is 45.

The spelling of 215815253472 in words is "two hundred fifteen billion, eight hundred fifteen million, two hundred fifty-three thousand, four hundred seventy-two".