257143811851 has 12 divisors (see below), whose sum is σ = 263587861768. Its totient is φ = 250852224672.

The previous prime is 257143811839. The next prime is 257143811867. The reversal of 257143811851 is 158118341752.

It is not a de Polignac number, because 257143811851 - 2⁷ = 257143811723 is a prime.

It is a super-2 number, since 2×257143811851² (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 (257143811051) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 488575 + ... + 867751.

Almost surely, 2^257143811851 is an apocalyptic number.

257143811851 is a deficient number, since it is larger than the sum of its proper divisors (6444049917).

257143811851 is an equidigital number, since it uses as much as digits as its factorization.

257143811851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379578 (or 379531 counting only the distinct ones).

The product of its digits is 268800, while the sum is 46.

The spelling of 257143811851 in words is "two hundred fifty-seven billion, one hundred forty-three million, eight hundred eleven thousand, eight hundred fifty-one".