445744613668642 has 4 divisors (see below), whose sum is σ = 668616920502966. Its totient is φ = 222872306834320.

The previous prime is 445744613668637. The next prime is 445744613668667. The reversal of 445744613668642 is 246866316447544.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 444135772571841 + 1608841096801 = 21074529^2 + 1268401^2 .

It is a super-2 number, since 2×445744613668642² (a number of 30 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111436153417159 + ... + 111436153417162.

Almost surely, 2^{445744613668642} is an apocalyptic number.

445744613668642 is a deficient number, since it is larger than the sum of its proper divisors (222872306834324).

445744613668642 is a wasteful number, since it uses less digits than its factorization.

445744613668642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222872306834323.

The product of its digits is 2229534720, while the sum is 70.

The spelling of 445744613668642 in words is "four hundred forty-five trillion, seven hundred forty-four billion, six hundred thirteen million, six hundred sixty-eight thousand, six hundred forty-two".