215136561425 has 6 divisors (see below), whose sum is σ = 266769336198. Its totient is φ = 172109249120.

The previous prime is 215136561413. The next prime is 215136561469. The reversal of 215136561425 is 524165631512.

It can be written as a sum of positive squares in 3 ways, for example, as 7576135681 + 207560425744 = 87041^2 + 455588^2 .

It is not a de Polignac number, because 215136561425 - 2⁶ = 215136561361 is a prime.

It is a Duffinian number.

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, 4302731204 + ... + 4302731253.

It is an arithmetic number, because the mean of its divisors is an integer number (44461556033).

Almost surely, 2^215136561425 is an apocalyptic number.

215136561425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

215136561425 is a deficient number, since it is larger than the sum of its proper divisors (51632774773).

215136561425 is an equidigital number, since it uses as much as digits as its factorization.

215136561425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8605462467 (or 8605462462 counting only the distinct ones).

The product of its digits is 216000, while the sum is 41.

The spelling of 215136561425 in words is "two hundred fifteen billion, one hundred thirty-six million, five hundred sixty-one thousand, four hundred twenty-five".