257399264761 has 4 divisors (see below), whose sum is σ = 257408347300. Its totient is φ = 257390182224.

The previous prime is 257399264743. The next prime is 257399264767. The reversal of 257399264761 is 167462993752.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 189939072400 + 67460192361 = 435820^2 + 259731^2 .

It is a cyclic number.

It is not a de Polignac number, because 257399264761 - 2²³ = 257390876153 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 257399264761.

It is not an unprimeable number, because it can be changed into a prime (257399264767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4498626 + ... + 4555483.

It is an arithmetic number, because the mean of its divisors is an integer number (64352086825).

Almost surely, 2^257399264761 is an apocalyptic number.

It is an amenable number.

257399264761 is a deficient number, since it is larger than the sum of its proper divisors (9082539).

257399264761 is an equidigital number, since it uses as much as digits as its factorization.

257399264761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9082538.

The product of its digits is 34292160, while the sum is 61.

The spelling of 257399264761 in words is "two hundred fifty-seven billion, three hundred ninety-nine million, two hundred sixty-four thousand, seven hundred sixty-one".