257473722631 has 2 divisors, whose sum is σ = 257473722632. Its totient is φ = 257473722630.

The previous prime is 257473722629. The next prime is 257473722637. The reversal of 257473722631 is 136227374752.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 257473722631 - 2¹ = 257473722629 is a prime.

It is a super-2 number, since 2×257473722631² (a number of 24 digits) contains 22 as substring.

Together with 257473722629, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257473722637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128736861315 + 128736861316.

It is an arithmetic number, because the mean of its divisors is an integer number (128736861316).

Almost surely, 2^257473722631 is an apocalyptic number.

257473722631 is a deficient number, since it is larger than the sum of its proper divisors (1).

257473722631 is an equidigital number, since it uses as much as digits as its factorization.

257473722631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2963520, while the sum is 49.

The spelling of 257473722631 in words is "two hundred fifty-seven billion, four hundred seventy-three million, seven hundred twenty-two thousand, six hundred thirty-one".