250440640169 has 2 divisors, whose sum is σ = 250440640170. Its totient is φ = 250440640168.

The previous prime is 250440640159. The next prime is 250440640193. The reversal of 250440640169 is 961046044052.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 179362414144 + 71078226025 = 423512^2 + 266605^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-250440640169 is a prime.

It is a super-2 number, since 2×250440640169² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (250440640129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125220320084 + 125220320085.

It is an arithmetic number, because the mean of its divisors is an integer number (125220320085).

Almost surely, 2^250440640169 is an apocalyptic number.

It is an amenable number.

250440640169 is a deficient number, since it is larger than the sum of its proper divisors (1).

250440640169 is an equidigital number, since it uses as much as digits as its factorization.

250440640169 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 207360, while the sum is 41.

The spelling of 250440640169 in words is "two hundred fifty billion, four hundred forty million, six hundred forty thousand, one hundred sixty-nine".