636046643 has 2 divisors, whose sum is σ = 636046644. Its totient is φ = 636046642.

The previous prime is 636046639. The next prime is 636046661. The reversal of 636046643 is 346640636.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 636046643 - 2² = 636046639 is a prime.

It is a super-3 number, since 3×636046643³ (a number of 27 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 636046597 and 636046606.

It is not a weakly prime, because it can be changed into another prime (636046633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 318023321 + 318023322.

It is an arithmetic number, because the mean of its divisors is an integer number (318023322).

Almost surely, 2^636046643 is an apocalyptic number.

636046643 is a deficient number, since it is larger than the sum of its proper divisors (1).

636046643 is an equidigital number, since it uses as much as digits as its factorization.

636046643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 186624, while the sum is 38.

The square root of 636046643 is about 25219.9651665104. The cubic root of 636046643 is about 859.9957828349.

The spelling of 636046643 in words is "six hundred thirty-six million, forty-six thousand, six hundred forty-three".