645930449918 has 8 divisors (see below), whose sum is σ = 1043426111448. Its totient is φ = 298121746104.

The previous prime is 645930449917. The next prime is 645930449929. The reversal of 645930449918 is 819944039546.

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

It is a super-2 number, since 2×645930449918² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645930449917) 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, 12421739396 + ... + 12421739447.

It is an arithmetic number, because the mean of its divisors is an integer number (130428263931).

Almost surely, 2^645930449918 is an apocalyptic number.

645930449918 is a deficient number, since it is larger than the sum of its proper divisors (397495661530).

645930449918 is a wasteful number, since it uses less digits than its factorization.

645930449918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24843478858.

The product of its (nonzero) digits is 33592320, while the sum is 62.

The spelling of 645930449918 in words is "six hundred forty-five billion, nine hundred thirty million, four hundred forty-nine thousand, nine hundred eighteen".