257323176156461 has 2 divisors, whose sum is σ = 257323176156462. Its totient is φ = 257323176156460.

The previous prime is 257323176156413. The next prime is 257323176156463. The reversal of 257323176156461 is 164651671323752.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 167795908403236 + 89527267753225 = 12953606^2 + 9461885^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-257323176156461 is a prime.

Together with 257323176156463, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 257323176156461.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257323176156463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128661588078230 + 128661588078231.

It is an arithmetic number, because the mean of its divisors is an integer number (128661588078231).

Almost surely, 2^{257323176156461} is an apocalyptic number.

It is an amenable number.

257323176156461 is a deficient number, since it is larger than the sum of its proper divisors (1).

257323176156461 is an equidigital number, since it uses as much as digits as its factorization.

257323176156461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38102400, while the sum is 59.

The spelling of 257323176156461 in words is "two hundred fifty-seven trillion, three hundred twenty-three billion, one hundred seventy-six million, one hundred fifty-six thousand, four hundred sixty-one".