257140628623 has 4 divisors (see below), whose sum is σ = 257169167608. Its totient is φ = 257112089640.

The previous prime is 257140628611. The next prime is 257140628639. The reversal of 257140628623 is 326826041752.

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

It is a cyclic number.

It is not a de Polignac number, because 257140628623 - 2¹³ = 257140620431 is a prime.

It is a super-2 number, since 2×257140628623² (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 (257140628123) 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, 14255973 + ... + 14273998.

It is an arithmetic number, because the mean of its divisors is an integer number (64292291902).

Almost surely, 2^257140628623 is an apocalyptic number.

257140628623 is a deficient number, since it is larger than the sum of its proper divisors (28538985).

257140628623 is an equidigital number, since it uses as much as digits as its factorization.

257140628623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28538984.

The product of its (nonzero) digits is 967680, while the sum is 46.

The spelling of 257140628623 in words is "two hundred fifty-seven billion, one hundred forty million, six hundred twenty-eight thousand, six hundred twenty-three".