6636774321 has 12 divisors (see below), whose sum is σ = 9767328948. Its totient is φ = 4341034464.

The previous prime is 6636774317. The next prime is 6636774401. The reversal of 6636774321 is 1234776366.

6636774321 is a `hidden beast` number, since 6 + 636 + 7 + 7 + 4 + 3 + 2 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1607127921 + 5029646400 = 40089^2 + 70920^2 .

It is not a de Polignac number, because 6636774321 - 2² = 6636774317 is a prime.

It is a super-3 number, since 3×6636774321³ (a number of 30 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (6636772321) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6956310 + ... + 6957263.

It is an arithmetic number, because the mean of its divisors is an integer number (813944079).

Almost surely, 2^6636774321 is an apocalyptic number.

It is an amenable number.

6636774321 is a deficient number, since it is larger than the sum of its proper divisors (3130554627).

6636774321 is a wasteful number, since it uses less digits than its factorization.

6636774321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13913632 (or 13913629 counting only the distinct ones).

The product of its digits is 762048, while the sum is 45.

The square root of 6636774321 is about 81466.3999511455. The cubic root of 6636774321 is about 1879.2548655069.

The spelling of 6636774321 in words is "six billion, six hundred thirty-six million, seven hundred seventy-four thousand, three hundred twenty-one".