6445444036 has 6 divisors (see below), whose sum is σ = 11279527070. Its totient is φ = 3222722016.

The previous prime is 6445444009. The next prime is 6445444051. The reversal of 6445444036 is 6304445446.

It can be written as a sum of positive squares in only one way, i.e., 5556807936 + 888636100 = 74544^2 + 29810^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 6445444036.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 805680501 + ... + 805680508.

Almost surely, 2^6445444036 is an apocalyptic number.

It is an amenable number.

6445444036 is a deficient number, since it is larger than the sum of its proper divisors (4834083034).

6445444036 is a wasteful number, since it uses less digits than its factorization.

6445444036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1611361013 (or 1611361011 counting only the distinct ones).

The product of its (nonzero) digits is 552960, while the sum is 40.

The square root of 6445444036 is about 80283.5228175745. The cubic root of 6445444036 is about 1861.0196009221.

The spelling of 6445444036 in words is "six billion, four hundred forty-five million, four hundred forty-four thousand, thirty-six".