249691902225 has 24 divisors (see below), whose sum is σ = 412920550560. Its totient is φ = 133137851520.

The previous prime is 249691902217. The next prime is 249691902247. The reversal of 249691902225 is 522209196942.

It is not a de Polignac number, because 249691902225 - 2³ = 249691902217 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 65115 + ... + 709664.

It is an arithmetic number, because the mean of its divisors is an integer number (17205022940).

Almost surely, 2^249691902225 is an apocalyptic number.

249691902225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

249691902225 is a deficient number, since it is larger than the sum of its proper divisors (163228648335).

249691902225 is a wasteful number, since it uses less digits than its factorization.

249691902225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 779089 (or 779084 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 51.

The spelling of 249691902225 in words is "two hundred forty-nine billion, six hundred ninety-one million, nine hundred two thousand, two hundred twenty-five".