445494644234639 has 4 divisors (see below), whose sum is σ = 451769216688720. Its totient is φ = 439220071780560.

The previous prime is 445494644234599. The next prime is 445494644234693. The reversal of 445494644234639 is 936432446494544.

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-445494644234639 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (71), and also a Moran number because the ratio is a prime number: 6274572454009 = 445494644234639 / (4 + 4 + 5 + 4 + 9 + 4 + 6 + 4 + 4 + 2 + 3 + 4 + 6 + 3 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (445494644237639) 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, 3137286226934 + ... + 3137286227075.

It is an arithmetic number, because the mean of its divisors is an integer number (112942304172180).

Almost surely, 2^{445494644234639} is an apocalyptic number.

445494644234639 is a deficient number, since it is larger than the sum of its proper divisors (6274572454081).

445494644234639 is an equidigital number, since it uses as much as digits as its factorization.

445494644234639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6274572454080.

The product of its digits is 4299816960, while the sum is 71.

The spelling of 445494644234639 in words is "four hundred forty-five trillion, four hundred ninety-four billion, six hundred forty-four million, two hundred thirty-four thousand, six hundred thirty-nine".