6645395488 has 12 divisors (see below), whose sum is σ = 13083122430. Its totient is φ = 3322697728.

The previous prime is 6645395467. The next prime is 6645395503. The reversal of 6645395488 is 8845935466.

It can be written as a sum of positive squares in only one way, i.e., 5998812304 + 646583184 = 77452^2 + 25428^2 .

It is a super-2 number, since 2×6645395488² = 88322562383861516288, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103834273 + ... + 103834336.

Almost surely, 2^6645395488 is an apocalyptic number.

It is an amenable number.

6645395488 is a deficient number, since it is larger than the sum of its proper divisors (6437726942).

6645395488 is a wasteful number, since it uses less digits than its factorization.

6645395488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207668619 (or 207668611 counting only the distinct ones).

The product of its digits is 24883200, while the sum is 58.

The square root of 6645395488 is about 81519.2951883172. The cubic root of 6645395488 is about 1880.0682305100.

The spelling of 6645395488 in words is "six billion, six hundred forty-five million, three hundred ninety-five thousand, four hundred eighty-eight".