205525405025 has 24 divisors (see below), whose sum is σ = 274510477824. Its totient is φ = 152198323200.

The previous prime is 205525405021. The next prime is 205525405067. The reversal of 205525405025 is 520504525502.

It is not a de Polignac number, because 205525405025 - 2² = 205525405021 is a prime.

It is a super-2 number, since 2×205525405025² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (205525405021) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5747264 + ... + 5782913.

It is an arithmetic number, because the mean of its divisors is an integer number (11437936576).

Almost surely, 2^205525405025 is an apocalyptic number.

205525405025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

205525405025 is a deficient number, since it is larger than the sum of its proper divisors (68985072799).

205525405025 is a wasteful number, since it uses less digits than its factorization.

205525405025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11530241 (or 11530236 counting only the distinct ones).

The product of its (nonzero) digits is 100000, while the sum is 35.

The spelling of 205525405025 in words is "two hundred five billion, five hundred twenty-five million, four hundred five thousand, twenty-five".