257061764305 has 4 divisors (see below), whose sum is σ = 308474117172. Its totient is φ = 205649411440.

The previous prime is 257061764303. The next prime is 257061764339. The reversal of 257061764305 is 503467160752.

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 35367691969 + 221694072336 = 188063^2 + 470844^2 .

It is not a de Polignac number, because 257061764305 - 2¹ = 257061764303 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (257061764303) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25706176426 + ... + 25706176435.

It is an arithmetic number, because the mean of its divisors is an integer number (77118529293).

Almost surely, 2^257061764305 is an apocalyptic number.

It is an amenable number.

257061764305 is a deficient number, since it is larger than the sum of its proper divisors (51412352867).

257061764305 is an equidigital number, since it uses as much as digits as its factorization.

257061764305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51412352866.

The product of its (nonzero) digits is 1058400, while the sum is 46.

The spelling of 257061764305 in words is "two hundred fifty-seven billion, sixty-one million, seven hundred sixty-four thousand, three hundred five".