6644625002 has 12 divisors (see below), whose sum is σ = 10298826018. Its totient is φ = 3215140200.

The previous prime is 6644624963. The next prime is 6644625011. The reversal of 6644625002 is 2005264466.

It can be written as a sum of positive squares in only one way, i.e., 4479491041 + 2165133961 = 66929^2 + 46531^2 .

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1726649 + ... + 1730492.

Almost surely, 2^6644625002 is an apocalyptic number.

6644625002 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

6644625002 is a deficient number, since it is larger than the sum of its proper divisors (3654201016).

6644625002 is a wasteful number, since it uses less digits than its factorization.

6644625002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3457205 (or 3457174 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 35.

The square root of 6644625002 is about 81514.5692621877. The cubic root of 6644625002 is about 1879.9955675541.

Adding to 6644625002 its reverse (2005264466), we get a palindrome (8649889468).

The spelling of 6644625002 in words is "six billion, six hundred forty-four million, six hundred twenty-five thousand, two".