215205423025 has 24 divisors (see below), whose sum is σ = 268094173464. Its totient is φ = 171365222400.

The previous prime is 215205423023. The next prime is 215205423067. The reversal of 215205423025 is 520324502512.

It can be written as a sum of positive squares in 12 ways, for example, as 93511193616 + 121694229409 = 305796^2 + 348847^2 .

It is not a de Polignac number, because 215205423025 - 2¹ = 215205423023 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215205423023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24559645 + ... + 24568405.

It is an arithmetic number, because the mean of its divisors is an integer number (11170590561).

Almost surely, 2^215205423025 is an apocalyptic number.

215205423025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

215205423025 is a deficient number, since it is larger than the sum of its proper divisors (52888750439).

215205423025 is a wasteful number, since it uses less digits than its factorization.

215205423025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13221 (or 13216 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 31.

Adding to 215205423025 its reverse (520324502512), we get a palindrome (735529925537).

The spelling of 215205423025 in words is "two hundred fifteen billion, two hundred five million, four hundred twenty-three thousand, twenty-five".