257601623 has 2 divisors, whose sum is σ = 257601624. Its totient is φ = 257601622.

The previous prime is 257601613. The next prime is 257601649. The reversal of 257601623 is 326106752.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 257601623 - 2⁴ = 257601607 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 257601623.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257601613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128800811 + 128800812.

It is an arithmetic number, because the mean of its divisors is an integer number (128800812).

Almost surely, 2^257601623 is an apocalyptic number.

257601623 is a deficient number, since it is larger than the sum of its proper divisors (1).

257601623 is an equidigital number, since it uses as much as digits as its factorization.

257601623 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 257601623 is about 16049.9726791045. The cubic root of 257601623 is about 636.2818449071.

The spelling of 257601623 in words is "two hundred fifty-seven million, six hundred one thousand, six hundred twenty-three".