257525465 has 4 divisors (see below), whose sum is σ = 309030564. Its totient is φ = 206020368.

The previous prime is 257525461. The next prime is 257525483. The reversal of 257525465 is 564525752.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 50395801 + 207129664 = 7099^2 + 14392^2 .

It is a cyclic number.

It is not a de Polignac number, because 257525465 - 2² = 257525461 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (257525461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25752542 + ... + 25752551.

It is an arithmetic number, because the mean of its divisors is an integer number (77257641).

Almost surely, 2^257525465 is an apocalyptic number.

It is an amenable number.

257525465 is a deficient number, since it is larger than the sum of its proper divisors (51505099).

257525465 is an equidigital number, since it uses as much as digits as its factorization.

257525465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51505098.

The product of its digits is 420000, while the sum is 41.

The square root of 257525465 is about 16047.5999763204. The cubic root of 257525465 is about 636.2191347317.

The spelling of 257525465 in words is "two hundred fifty-seven million, five hundred twenty-five thousand, four hundred sixty-five".