63645506351 has 4 divisors (see below), whose sum is σ = 72737721552. Its totient is φ = 54553291152.

The previous prime is 63645506273. The next prime is 63645506363. The reversal of 63645506351 is 15360554636.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 63645506351 - 2³⁴ = 46465637167 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 (63645500351) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4546107590 + ... + 4546107603.

It is an arithmetic number, because the mean of its divisors is an integer number (18184430388).

Almost surely, 2^63645506351 is an apocalyptic number.

63645506351 is a deficient number, since it is larger than the sum of its proper divisors (9092215201).

63645506351 is an equidigital number, since it uses as much as digits as its factorization.

63645506351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9092215200.

The product of its (nonzero) digits is 972000, while the sum is 44.

The spelling of 63645506351 in words is "sixty-three billion, six hundred forty-five million, five hundred six thousand, three hundred fifty-one".