256198725 has 72 divisors (see below), whose sum is σ = 494587392. Its totient is φ = 126403200.

The previous prime is 256198711. The next prime is 256198727. The reversal of 256198725 is 527891652.

256198725 is a `hidden beast` number, since 2 + 5 + 619 + 8 + 7 + 25 = 666.

It is not a de Polignac number, because 256198725 - 2⁹ = 256198213 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256198727) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 159627 + ... + 161223.

Almost surely, 2^256198725 is an apocalyptic number.

256198725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

256198725 is a deficient number, since it is larger than the sum of its proper divisors (238388667).

256198725 is a wasteful number, since it uses less digits than its factorization.

256198725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1667 (or 1659 counting only the distinct ones).

The product of its digits is 302400, while the sum is 45.

The square root of 256198725 is about 16006.2089515288. The cubic root of 256198725 is about 635.1246784346.

The spelling of 256198725 in words is "two hundred fifty-six million, one hundred ninety-eight thousand, seven hundred twenty-five".