257297727573 has 6 divisors (see below), whose sum is σ = 371652273174. Its totient is φ = 171531818376.

The previous prime is 257297727563. The next prime is 257297727581. The reversal of 257297727573 is 375727792752.

It is a happy number.

257297727573 is a `hidden beast` number, since 2 + 5 + 7 + 297 + 7 + 275 + 73 = 666.

It can be written as a sum of positive squares in only one way, i.e., 230806258929 + 26491468644 = 480423^2 + 162762^2 .

It is not a de Polignac number, because 257297727573 - 2⁵ = 257297727541 is a prime.

It is a super-2 number, since 2×257297727573² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 257297727573.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257297727563) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14294318190 + ... + 14294318207.

It is an arithmetic number, because the mean of its divisors is an integer number (61942045529).

Almost surely, 2^257297727573 is an apocalyptic number.

It is an amenable number.

257297727573 is a deficient number, since it is larger than the sum of its proper divisors (114354545601).

257297727573 is a wasteful number, since it uses less digits than its factorization.

257297727573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28588636403 (or 28588636400 counting only the distinct ones).

The product of its digits is 90757800, while the sum is 63.

The spelling of 257297727573 in words is "two hundred fifty-seven billion, two hundred ninety-seven million, seven hundred twenty-seven thousand, five hundred seventy-three".