257010947465 has 4 divisors (see below), whose sum is σ = 308413136964. Its totient is φ = 205608757968.

The previous prime is 257010947461. The next prime is 257010947467. The reversal of 257010947465 is 564749010752.

It is a happy number.

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 174345497209 + 82665450256 = 417547^2 + 287516^2 .

It is a cyclic number.

It is not a de Polignac number, because 257010947465 - 2² = 257010947461 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257010947461) 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, 25701094742 + ... + 25701094751.

It is an arithmetic number, because the mean of its divisors is an integer number (77103284241).

Almost surely, 2^257010947465 is an apocalyptic number.

It is an amenable number.

257010947465 is a deficient number, since it is larger than the sum of its proper divisors (51402189499).

257010947465 is an equidigital number, since it uses as much as digits as its factorization.

257010947465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51402189498.

The product of its (nonzero) digits is 2116800, while the sum is 50.

The spelling of 257010947465 in words is "two hundred fifty-seven billion, ten million, nine hundred forty-seven thousand, four hundred sixty-five".