636342370073 has 2 divisors, whose sum is σ = 636342370074. Its totient is φ = 636342370072.

The previous prime is 636342369997. The next prime is 636342370109. The reversal of 636342370073 is 370073243636.

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., 542125909264 + 94216460809 = 736292^2 + 306947^2 .

It is a cyclic number.

It is not a de Polignac number, because 636342370073 - 2²² = 636338175769 is a prime.

It is a super-2 number, since 2×636342370073² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (636342372073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318171185036 + 318171185037.

It is an arithmetic number, because the mean of its divisors is an integer number (318171185037).

Almost surely, 2^636342370073 is an apocalyptic number.

It is an amenable number.

636342370073 is a deficient number, since it is larger than the sum of its proper divisors (1).

636342370073 is an equidigital number, since it uses as much as digits as its factorization.

636342370073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1143072, while the sum is 44.

The spelling of 636342370073 in words is "six hundred thirty-six billion, three hundred forty-two million, three hundred seventy thousand, seventy-three".