215839222225 has 27 divisors (see below), whose sum is σ = 294218339611. Its totient is φ = 156955396400.

The previous prime is 215839222211. The next prime is 215839222301. The reversal of 215839222225 is 522222938512.

The square root of 215839222225 is 464585.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 77702120001 + 138137102224 = 278751^2 + 371668^2 .

It is not a de Polignac number, because 215839222225 - 2⁷ = 215839222097 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 25547952 + ... + 25556398.

Almost surely, 2^215839222225 is an apocalyptic number.

215839222225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

215839222225 is the 464585-th square number.

215839222225 is the 232293-rd centered octagonal number.

It is an amenable number.

215839222225 is a deficient number, since it is larger than the sum of its proper divisors (78379117386).

215839222225 is an frugal number, since it uses more digits than its factorization.

215839222225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16926 (or 8463 counting only the distinct ones).

The product of its digits is 345600, while the sum is 43.

The spelling of 215839222225 in words is "two hundred fifteen billion, eight hundred thirty-nine million, two hundred twenty-two thousand, two hundred twenty-five".