257386883731 has 16 divisors (see below), whose sum is σ = 272944488448. Its totient is φ = 242286357600.

The previous prime is 257386883681. The next prime is 257386883777. The reversal of 257386883731 is 137388683752.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 257386883731 - 2¹⁷ = 257386752659 is a prime.

It is a super-2 number, since 2×257386883731² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 257386883731.

It is not an unprimeable number, because it can be changed into a prime (257386883531) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4494166 + ... + 4551076.

It is an arithmetic number, because the mean of its divisors is an integer number (17059030528).

Almost surely, 2^257386883731 is an apocalyptic number.

257386883731 is a deficient number, since it is larger than the sum of its proper divisors (15557604717).

257386883731 is a wasteful number, since it uses less digits than its factorization.

257386883731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60922.

The product of its digits is 40642560, while the sum is 61.

The spelling of 257386883731 in words is "two hundred fifty-seven billion, three hundred eighty-six million, eight hundred eighty-three thousand, seven hundred thirty-one".