257902171557091 has 2 divisors, whose sum is σ = 257902171557092. Its totient is φ = 257902171557090.

The previous prime is 257902171557089. The next prime is 257902171557113. The reversal of 257902171557091 is 190755171209752.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 257902171557091 - 2¹ = 257902171557089 is a prime.

Together with 257902171557089, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (257902171558091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128951085778545 + 128951085778546.

It is an arithmetic number, because the mean of its divisors is an integer number (128951085778546).

Almost surely, 2^{257902171557091} is an apocalyptic number.

257902171557091 is a deficient number, since it is larger than the sum of its proper divisors (1).

257902171557091 is an equidigital number, since it uses as much as digits as its factorization.

257902171557091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13891500, while the sum is 61.

The spelling of 257902171557091 in words is "two hundred fifty-seven trillion, nine hundred two billion, one hundred seventy-one million, five hundred fifty-seven thousand, ninety-one".