637446372161 has 2 divisors, whose sum is σ = 637446372162. Its totient is φ = 637446372160.

The previous prime is 637446372139. The next prime is 637446372179. The reversal of 637446372161 is 161273644736.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 571451331136 + 65995041025 = 755944^2 + 256895^2 .

It is a cyclic number.

It is not a de Polignac number, because 637446372161 - 2³⁰ = 636372630337 is a prime.

It is not a weakly prime, because it can be changed into another prime (637446372061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318723186080 + 318723186081.

It is an arithmetic number, because the mean of its divisors is an integer number (318723186081).

Almost surely, 2^637446372161 is an apocalyptic number.

It is an amenable number.

637446372161 is a deficient number, since it is larger than the sum of its proper divisors (1).

637446372161 is an equidigital number, since it uses as much as digits as its factorization.

637446372161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3048192, while the sum is 50.

The spelling of 637446372161 in words is "six hundred thirty-seven billion, four hundred forty-six million, three hundred seventy-two thousand, one hundred sixty-one".