6445316636 has 12 divisors (see below), whose sum is σ = 12304695480. Its totient is φ = 2929689360.

The previous prime is 6445316617. The next prime is 6445316651. The reversal of 6445316636 is 6366135446.

It is a Harshad number since it is a multiple of its sum of digits (44), and also a Moran number because the ratio is a prime number: 146484469 = 6445316636 / (6 + 4 + 4 + 5 + 3 + 1 + 6 + 6 + 3 + 6).

It is a congruent number.

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, 73242191 + ... + 73242278.

It is an arithmetic number, because the mean of its divisors is an integer number (1025391290).

Almost surely, 2^6445316636 is an apocalyptic number.

It is an amenable number.

6445316636 is a deficient number, since it is larger than the sum of its proper divisors (5859378844).

6445316636 is a wasteful number, since it uses less digits than its factorization.

6445316636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146484484 (or 146484482 counting only the distinct ones).

The product of its digits is 933120, while the sum is 44.

The square root of 6445316636 is about 80282.7293756260. The cubic root of 6445316636 is about 1861.0073392657.

The spelling of 6445316636 in words is "six billion, four hundred forty-five million, three hundred sixteen thousand, six hundred thirty-six".