215115340225 has 6 divisors (see below), whose sum is σ = 266743021910. Its totient is φ = 172092272160.

The previous prime is 215115340211. The next prime is 215115340241. The reversal of 215115340225 is 522043511512.

It can be written as a sum of positive squares in 3 ways, for example, as 5578446721 + 209536893504 = 74689^2 + 457752^2 .

It is not a de Polignac number, because 215115340225 - 2¹⁵ = 215115307457 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4302306780 + ... + 4302306829.

Almost surely, 2^215115340225 is an apocalyptic number.

215115340225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

215115340225 is a deficient number, since it is larger than the sum of its proper divisors (51627681685).

215115340225 is an equidigital number, since it uses as much as digits as its factorization.

215115340225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8604613619 (or 8604613614 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 31.

Adding to 215115340225 its reverse (522043511512), we get a palindrome (737158851737).

The spelling of 215115340225 in words is "two hundred fifteen billion, one hundred fifteen million, three hundred forty thousand, two hundred twenty-five".