645634312163 has 8 divisors (see below), whose sum is σ = 648214560000. Its totient is φ = 643059210888.

The previous prime is 645634312159. The next prime is 645634312171. The reversal of 645634312163 is 361213436546.

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

It is a cyclic number.

It is not a de Polignac number, because 645634312163 - 2² = 645634312159 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645634312123) 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, 1035143 + ... + 1537136.

It is an arithmetic number, because the mean of its divisors is an integer number (81026820000).

Almost surely, 2^645634312163 is an apocalyptic number.

645634312163 is a deficient number, since it is larger than the sum of its proper divisors (2580247837).

645634312163 is a wasteful number, since it uses less digits than its factorization.

645634312163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2573281.

The product of its digits is 933120, while the sum is 44.

The spelling of 645634312163 in words is "six hundred forty-five billion, six hundred thirty-four million, three hundred twelve thousand, one hundred sixty-three".