257126224387 has 2 divisors, whose sum is σ = 257126224388. Its totient is φ = 257126224386.

The previous prime is 257126224351. The next prime is 257126224393. The reversal of 257126224387 is 783422621752.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 257126224387 - 2²⁷ = 256992006659 is a prime.

It is a super-2 number, since 2×257126224387² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 257126224387.

It is not a weakly prime, because it can be changed into another prime (257126224087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128563112193 + 128563112194.

It is an arithmetic number, because the mean of its divisors is an integer number (128563112194).

Almost surely, 2^257126224387 is an apocalyptic number.

257126224387 is a deficient number, since it is larger than the sum of its proper divisors (1).

257126224387 is an equidigital number, since it uses as much as digits as its factorization.

257126224387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2257920, while the sum is 49.

The spelling of 257126224387 in words is "two hundred fifty-seven billion, one hundred twenty-six million, two hundred twenty-four thousand, three hundred eighty-seven".