257939224987 has 2 divisors, whose sum is σ = 257939224988. Its totient is φ = 257939224986.

The previous prime is 257939224889. The next prime is 257939225009. The reversal of 257939224987 is 789422939752.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 257939224987 - 2³¹ = 255791741339 is a prime.

It is not a weakly prime, because it can be changed into another prime (257930224987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128969612493 + 128969612494.

It is an arithmetic number, because the mean of its divisors is an integer number (128969612494).

Almost surely, 2^257939224987 is an apocalyptic number.

257939224987 is a deficient number, since it is larger than the sum of its proper divisors (1).

257939224987 is an equidigital number, since it uses as much as digits as its factorization.

257939224987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 137168640, while the sum is 67.

The spelling of 257939224987 in words is "two hundred fifty-seven billion, nine hundred thirty-nine million, two hundred twenty-four thousand, nine hundred eighty-seven".