645646438117 has 8 divisors (see below), whose sum is σ = 656145959040. Its totient is φ = 635205086880.

The previous prime is 645646438103. The next prime is 645646438123. The reversal of 645646438117 is 711834646546.

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

It is a de Polignac number, because none of the positive numbers 2^k-645646438117 is a prime.

It is a super-2 number, since 2×645646438117² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645646438147) 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, 14520043 + ... + 14564440.

It is an arithmetic number, because the mean of its divisors is an integer number (82018244880).

Almost surely, 2^645646438117 is an apocalyptic number.

It is an amenable number.

645646438117 is a deficient number, since it is larger than the sum of its proper divisors (10499520923).

645646438117 is a wasteful number, since it uses less digits than its factorization.

645646438117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29084843.

The product of its digits is 11612160, while the sum is 55.

The spelling of 645646438117 in words is "six hundred forty-five billion, six hundred forty-six million, four hundred thirty-eight thousand, one hundred seventeen".