257081653 has 4 divisors (see below), whose sum is σ = 257176620. Its totient is φ = 256986688.

The previous prime is 257081621. The next prime is 257081687. The reversal of 257081653 is 356180752.

257081653 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 73153809 + 183927844 = 8553^2 + 13562^2 .

It is a cyclic number.

It is not a de Polignac number, because 257081653 - 2⁵ = 257081621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257081353) 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, 43300 + ... + 48877.

It is an arithmetic number, because the mean of its divisors is an integer number (64294155).

Almost surely, 2^257081653 is an apocalyptic number.

It is an amenable number.

257081653 is a deficient number, since it is larger than the sum of its proper divisors (94967).

257081653 is an equidigital number, since it uses as much as digits as its factorization.

257081653 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94966.

The product of its (nonzero) digits is 50400, while the sum is 37.

The square root of 257081653 is about 16033.7660267325. The cubic root of 257081653 is about 635.8534439746.

Subtracting 257081653 from its reverse (356180752), we obtain a palindrome (99099099).

The spelling of 257081653 in words is "two hundred fifty-seven million, eighty-one thousand, six hundred fifty-three".