645155143439 has 4 divisors (see below), whose sum is σ = 645239035560. Its totient is φ = 645071251320.

The previous prime is 645155143429. The next prime is 645155143453. The reversal of 645155143439 is 934341551546.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-645155143439 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 (645155143429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41934524 + ... + 41949905.

It is an arithmetic number, because the mean of its divisors is an integer number (161309758890).

Almost surely, 2^645155143439 is an apocalyptic number.

645155143439 is a deficient number, since it is larger than the sum of its proper divisors (83892121).

645155143439 is an equidigital number, since it uses as much as digits as its factorization.

645155143439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83892120.

The product of its digits is 3888000, while the sum is 50.

The spelling of 645155143439 in words is "six hundred forty-five billion, one hundred fifty-five million, one hundred forty-three thousand, four hundred thirty-nine".