645347745189 has 48 divisors (see below), whose sum is σ = 1068201598464. Its totient is φ = 367779052800.

The previous prime is 645347745179. The next prime is 645347745197. The reversal of 645347745189 is 981547743546.

645347745189 is a `hidden beast` number, since 6 + 4 + 5 + 3 + 47 + 74 + 518 + 9 = 666.

It is not a de Polignac number, because 645347745189 - 2⁵ = 645347745157 is a prime.

It is a super-3 number, since 3×645347745189³ (a number of 36 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645347745149) 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 47 ways as a sum of consecutive naturals, for example, 70889412 + ... + 70898514.

It is an arithmetic number, because the mean of its divisors is an integer number (22254199968).

Almost surely, 2^645347745189 is an apocalyptic number.

It is an amenable number.

645347745189 is a deficient number, since it is larger than the sum of its proper divisors (422853853275).

645347745189 is a wasteful number, since it uses less digits than its factorization.

645347745189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12018 (or 12015 counting only the distinct ones).

The product of its digits is 101606400, while the sum is 63.

The spelling of 645347745189 in words is "six hundred forty-five billion, three hundred forty-seven million, seven hundred forty-five thousand, one hundred eighty-nine".