257334625561 has 16 divisors (see below), whose sum is σ = 281085298816. Its totient is φ = 234152747136.

The previous prime is 257334625519. The next prime is 257334625601. The reversal of 257334625561 is 165526433752.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 257334625561 - 2²⁵ = 257301071129 is a prime.

It is a super-2 number, since 2×257334625561² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257334625661) 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, 1616026 + ... + 1768108.

It is an arithmetic number, because the mean of its divisors is an integer number (17567831176).

Almost surely, 2^257334625561 is an apocalyptic number.

It is an amenable number.

257334625561 is a deficient number, since it is larger than the sum of its proper divisors (23750673255).

257334625561 is a wasteful number, since it uses less digits than its factorization.

257334625561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153952.

The product of its digits is 4536000, while the sum is 49.

The spelling of 257334625561 in words is "two hundred fifty-seven billion, three hundred thirty-four million, six hundred twenty-five thousand, five hundred sixty-one".