636445221373 has 8 divisors (see below), whose sum is σ = 685411550208. Its totient is φ = 587480178864.

The previous prime is 636445221353. The next prime is 636445221409. The reversal of 636445221373 is 373122544636.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-636445221373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636445221343) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 869436 + ... + 1424362.

It is an arithmetic number, because the mean of its divisors is an integer number (85676443776).

Almost surely, 2^636445221373 is an apocalyptic number.

It is an amenable number.

636445221373 is a deficient number, since it is larger than the sum of its proper divisors (48966328835).

636445221373 is a wasteful number, since it uses less digits than its factorization.

636445221373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643163.

The product of its digits is 2177280, while the sum is 46.

The spelling of 636445221373 in words is "six hundred thirty-six billion, four hundred forty-five million, two hundred twenty-one thousand, three hundred seventy-three".