205515625 has 28 divisors (see below), whose sum is σ = 293746240. Its totient is φ = 140850000.

The previous prime is 205515613. The next prime is 205515637. The reversal of 205515625 is 526515502.

It is an interprime number because it is at equal distance from previous prime (205515613) and next prime (205515637).

It is not a de Polignac number, because 205515625 - 2⁵ = 205515593 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 108436 + ... + 110314.

Almost surely, 2^205515625 is an apocalyptic number.

205515625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

205515625 is a deficient number, since it is larger than the sum of its proper divisors (88230615).

205515625 is an frugal number, since it uses more digits than its factorization.

205515625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1916 (or 1891 counting only the distinct ones).

The product of its (nonzero) digits is 15000, while the sum is 31.

The square root of 205515625 is about 14335.8161609306. The cubic root of 205515625 is about 590.1308002637.

The spelling of 205515625 in words is "two hundred five million, five hundred fifteen thousand, six hundred twenty-five".