6644643602 has 32 divisors (see below), whose sum is σ = 10660584960. Its totient is φ = 3100930560.

The previous prime is 6644643583. The next prime is 6644643617. The reversal of 6644643602 is 2063464466.

It is a self number, because there is not a number n which added to its sum of digits gives 6644643602.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 176738 + ... + 211010.

It is an arithmetic number, because the mean of its divisors is an integer number (333143280).

Almost surely, 2^6644643602 is an apocalyptic number.

6644643602 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

6644643602 is a deficient number, since it is larger than the sum of its proper divisors (4015941358).

6644643602 is a wasteful number, since it uses less digits than its factorization.

6644643602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34418.

The product of its (nonzero) digits is 497664, while the sum is 41.

The square root of 6644643602 is about 81514.6833521421. The cubic root of 6644643602 is about 1879.9973217481.

The spelling of 6644643602 in words is "six billion, six hundred forty-four million, six hundred forty-three thousand, six hundred two".