6445442645156 has 12 divisors (see below), whose sum is σ = 11279542659420. Its totient is φ = 3222716171040.

The previous prime is 6445442645123. The next prime is 6445442645183. The reversal of 6445442645156 is 6515462445446.

It can be written as a sum of positive squares in 2 ways, for example, as 1581582912100 + 4863859733056 = 1257610^2 + 2205416^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3529046 + ... + 5034386.

It is an arithmetic number, because the mean of its divisors is an integer number (939961888285).

Almost surely, 2^{6445442645156} is an apocalyptic number.

It is an amenable number.

6445442645156 is a deficient number, since it is larger than the sum of its proper divisors (4834100014264).

6445442645156 is a wasteful number, since it uses less digits than its factorization.

6445442645156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2575774 (or 2575772 counting only the distinct ones).

The product of its digits is 55296000, while the sum is 56.

The spelling of 6445442645156 in words is "six trillion, four hundred forty-five billion, four hundred forty-two million, six hundred forty-five thousand, one hundred fifty-six".