257126346861 has 16 divisors (see below), whose sum is σ = 346102967616. Its totient is φ = 169785697536.

The previous prime is 257126346847. The next prime is 257126346877. The reversal of 257126346861 is 168643621752.

It is not a de Polignac number, because 257126346861 - 2⁷ = 257126346733 is a prime.

It is a super-2 number, since 2×257126346861² (a number of 24 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257126346821) 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, 247011 + ... + 758463.

It is an arithmetic number, because the mean of its divisors is an integer number (21631435476).

Almost surely, 2^257126346861 is an apocalyptic number.

It is an amenable number.

257126346861 is a deficient number, since it is larger than the sum of its proper divisors (88976620755).

257126346861 is a wasteful number, since it uses less digits than its factorization.

257126346861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513052.

The product of its digits is 2903040, while the sum is 51.

The spelling of 257126346861 in words is "two hundred fifty-seven billion, one hundred twenty-six million, three hundred forty-six thousand, eight hundred sixty-one".