215315345125 has 16 divisors (see below), whose sum is σ = 268750360944. Its totient is φ = 172228680000.

The previous prime is 215315345107. The next prime is 215315345143. The reversal of 215315345125 is 521543513512.

It is an interprime number because it is at equal distance from previous prime (215315345107) and next prime (215315345143).

It can be written as a sum of positive squares in 8 ways, for example, as 105911844481 + 109403500644 = 325441^2 + 330762^2 .

It is not a de Polignac number, because 215315345125 - 2¹³ = 215315336933 is a prime.

It is a super-2 number, since 2×215315345125² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 828415 + ... + 1056835.

It is an arithmetic number, because the mean of its divisors is an integer number (16796897559).

Almost surely, 2^215315345125 is an apocalyptic number.

215315345125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

215315345125 is a deficient number, since it is larger than the sum of its proper divisors (53435015819).

215315345125 is an equidigital number, since it uses as much as digits as its factorization.

215315345125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235977 (or 235967 counting only the distinct ones).

The product of its digits is 90000, while the sum is 37.

Adding to 215315345125 its reverse (521543513512), we get a palindrome (736858858637).

The spelling of 215315345125 in words is "two hundred fifteen billion, three hundred fifteen million, three hundred forty-five thousand, one hundred twenty-five".