251266470791 has 12 divisors (see below), whose sum is σ = 295811133912. Its totient is φ = 212776422768.

The previous prime is 251266470773. The next prime is 251266470803. The reversal of 251266470791 is 197074662152.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-251266470791 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (251266470391) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30886820 + ... + 30894953.

It is an arithmetic number, because the mean of its divisors is an integer number (24650927826).

Almost surely, 2^251266470791 is an apocalyptic number.

251266470791 is a deficient number, since it is larger than the sum of its proper divisors (44544663121).

251266470791 is an equidigital number, since it uses as much as digits as its factorization.

251266470791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61781870 (or 61781863 counting only the distinct ones).

The product of its (nonzero) digits is 1270080, while the sum is 50.

The spelling of 251266470791 in words is "two hundred fifty-one billion, two hundred sixty-six million, four hundred seventy thousand, seven hundred ninety-one".