63645373137 has 4 divisors (see below), whose sum is σ = 84860497520. Its totient is φ = 42430248756.

The previous prime is 63645373117. The next prime is 63645373213. The reversal of 63645373137 is 73137354636.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 63645373137 - 2¹² = 63645369041 is a prime.

It is a super-2 number, since 2×63645373137² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63645373117) 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 in 3 ways as a sum of consecutive naturals, for example, 10607562187 + ... + 10607562192.

It is an arithmetic number, because the mean of its divisors is an integer number (21215124380).

Almost surely, 2^63645373137 is an apocalyptic number.

It is an amenable number.

63645373137 is a deficient number, since it is larger than the sum of its proper divisors (21215124383).

63645373137 is a wasteful number, since it uses less digits than its factorization.

63645373137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21215124382.

The product of its digits is 2857680, while the sum is 48.

The spelling of 63645373137 in words is "sixty-three billion, six hundred forty-five million, three hundred seventy-three thousand, one hundred thirty-seven".