257634918293 has 4 divisors (see below), whose sum is σ = 258277399788. Its totient is φ = 256992436800.

The previous prime is 257634918259. The next prime is 257634918353. The reversal of 257634918293 is 392819436752.

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 256438934404 + 1195983889 = 506398^2 + 34583^2 .

It is a cyclic number.

It is not a de Polignac number, because 257634918293 - 2¹⁰ = 257634917269 is a prime.

It is a super-2 number, since 2×257634918293² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257634918223) 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, 321240146 + ... + 321240947.

It is an arithmetic number, because the mean of its divisors is an integer number (64569349947).

Almost surely, 2^257634918293 is an apocalyptic number.

It is an amenable number.

257634918293 is a deficient number, since it is larger than the sum of its proper divisors (642481495).

257634918293 is an equidigital number, since it uses as much as digits as its factorization.

257634918293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 642481494.

The product of its digits is 19595520, while the sum is 59.

The spelling of 257634918293 in words is "two hundred fifty-seven billion, six hundred thirty-four million, nine hundred eighteen thousand, two hundred ninety-three".