251038728071 has 2 divisors, whose sum is σ = 251038728072. Its totient is φ = 251038728070.

The previous prime is 251038728067. The next prime is 251038728077. The reversal of 251038728071 is 170827830152.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 251038728071 - 2² = 251038728067 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251038728077) 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, 125519364035 + 125519364036.

It is an arithmetic number, because the mean of its divisors is an integer number (125519364036).

Almost surely, 2^251038728071 is an apocalyptic number.

251038728071 is a deficient number, since it is larger than the sum of its proper divisors (1).

251038728071 is an equidigital number, since it uses as much as digits as its factorization.

251038728071 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 188160, while the sum is 44.

The spelling of 251038728071 in words is "two hundred fifty-one billion, thirty-eight million, seven hundred twenty-eight thousand, seventy-one".