215993382025 has 6 divisors (see below), whose sum is σ = 267831793742. Its totient is φ = 172794705600.

The previous prime is 215993382023. The next prime is 215993382113. The reversal of 215993382025 is 520283399512.

215993382025 = 328628² + 328629².

It can be written as a sum of positive squares in 3 ways, for example, as 49937947024 + 166055435001 = 223468^2 + 407499^2 .

It is not a de Polignac number, because 215993382025 - 2¹ = 215993382023 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 215993382025.

It is not an unprimeable number, because it can be changed into a prime (215993382023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4319867616 + ... + 4319867665.

Almost surely, 2^215993382025 is an apocalyptic number.

215993382025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

215993382025 is the 328629-th centered square number.

It is an amenable number.

215993382025 is a deficient number, since it is larger than the sum of its proper divisors (51838411717).

215993382025 is an equidigital number, since it uses as much as digits as its factorization.

215993382025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8639735291 (or 8639735286 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 49.

The spelling of 215993382025 in words is "two hundred fifteen billion, nine hundred ninety-three million, three hundred eighty-two thousand, twenty-five".