251042643277 has 2 divisors, whose sum is σ = 251042643278. Its totient is φ = 251042643276.

The previous prime is 251042643223. The next prime is 251042643289. The reversal of 251042643277 is 772346240152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 247102444836 + 3940198441 = 497094^2 + 62771^2 .

It is a cyclic number.

It is not a de Polignac number, because 251042643277 - 2¹⁵ = 251042610509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251042643217) 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 as a sum of consecutive naturals, namely, 125521321638 + 125521321639.

It is an arithmetic number, because the mean of its divisors is an integer number (125521321639).

Almost surely, 2^251042643277 is an apocalyptic number.

It is an amenable number.

251042643277 is a deficient number, since it is larger than the sum of its proper divisors (1).

251042643277 is an equidigital number, since it uses as much as digits as its factorization.

251042643277 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 564480, while the sum is 43.

The spelling of 251042643277 in words is "two hundred fifty-one billion, forty-two million, six hundred forty-three thousand, two hundred seventy-seven".