215969325625 has 45 divisors (see below), whose sum is σ = 279938932273. Its totient is φ = 166557440000.

The previous prime is 215969325623. The next prime is 215969325631. The reversal of 215969325625 is 526523969512.

It is a happy number.

The square root of 215969325625 is 464725.

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

It can be written as a sum of positive squares in 22 ways, for example, as 206700257449 + 9269068176 = 454643^2 + 96276^2 .

It is not a de Polignac number, because 215969325625 - 2¹ = 215969325623 is a prime.

It is a super-2 number, since 2×215969325625² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

Its product of digits (8748000) is a multiple of the sum of its prime divisors (675).

It is not an unprimeable number, because it can be changed into a prime (215969325623) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 336925305 + ... + 336925945.

Almost surely, 2^215969325625 is an apocalyptic number.

215969325625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

215969325625 is the 464725-th square number.

215969325625 is the 232363-rd centered octagonal number.

It is an amenable number.

215969325625 is a deficient number, since it is larger than the sum of its proper divisors (63969606648).

215969325625 is an frugal number, since it uses more digits than its factorization.

215969325625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1360 (or 675 counting only the distinct ones).

The product of its digits is 8748000, while the sum is 55.

The spelling of 215969325625 in words is "two hundred fifteen billion, nine hundred sixty-nine million, three hundred twenty-five thousand, six hundred twenty-five".