6646336641 has 48 divisors (see below), whose sum is σ = 11070259200. Its totient is φ = 3763947744.

The previous prime is 6646336639. The next prime is 6646336651. The reversal of 6646336641 is 1466336466.

6646336641 is a `hidden beast` number, since 6 + 6 + 4 + 633 + 6 + 6 + 4 + 1 = 666.

It is not a de Polignac number, because 6646336641 - 2¹ = 6646336639 is a prime.

It is a super-3 number, since 3×6646336641³ (a number of 30 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (6646336621) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4618000 + ... + 4619438.

It is an arithmetic number, because the mean of its divisors is an integer number (230630400).

Almost surely, 2^6646336641 is an apocalyptic number.

It is an amenable number.

6646336641 is a deficient number, since it is larger than the sum of its proper divisors (4423922559).

6646336641 is a wasteful number, since it uses less digits than its factorization.

6646336641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2058 (or 2055 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 45.

The square root of 6646336641 is about 81525.0675620695. The cubic root of 6646336641 is about 1880.1569811009.

The spelling of 6646336641 in words is "six billion, six hundred forty-six million, three hundred thirty-six thousand, six hundred forty-one".