257421763 has 2 divisors, whose sum is σ = 257421764. Its totient is φ = 257421762.

The previous prime is 257421757. The next prime is 257421793. The reversal of 257421763 is 367124752.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 257421763 - 2²¹ = 255324611 is a prime.

It is not a weakly prime, because it can be changed into another prime (257421733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128710881 + 128710882.

It is an arithmetic number, because the mean of its divisors is an integer number (128710882).

Almost surely, 2^257421763 is an apocalyptic number.

257421763 is a deficient number, since it is larger than the sum of its proper divisors (1).

257421763 is an equidigital number, since it uses as much as digits as its factorization.

257421763 is an evil number, because the sum of its binary digits is even.

The product of its digits is 70560, while the sum is 37.

The square root of 257421763 is about 16044.3685759210. The cubic root of 257421763 is about 636.1337243371.

The spelling of 257421763 in words is "two hundred fifty-seven million, four hundred twenty-one thousand, seven hundred sixty-three".