63645373138 has 8 divisors (see below), whose sum is σ = 95751348732. Its totient is φ = 31728256896.

The previous prime is 63645373117. The next prime is 63645373213. The reversal of 63645373138 is 83137354636.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 60724294929 + 2921078209 = 246423^2 + 54047^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 63645373091 and 63645373100.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 47213995 + ... + 47215342.

Almost surely, 2^63645373138 is an apocalyptic number.

63645373138 is a deficient number, since it is larger than the sum of its proper divisors (32105975594).

63645373138 is a wasteful number, since it uses less digits than its factorization.

63645373138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94429676.

The product of its digits is 3265920, while the sum is 49.

The spelling of 63645373138 in words is "sixty-three billion, six hundred forty-five million, three hundred seventy-three thousand, one hundred thirty-eight".