6646033477 has 4 divisors (see below), whose sum is σ = 6682752076. Its totient is φ = 6609314880.

The previous prime is 6646033469. The next prime is 6646033531. The reversal of 6646033477 is 7743306466.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 995654916 + 5650378561 = 31554^2 + 75169^2 .

It is a cyclic number.

It is not a de Polignac number, because 6646033477 - 2³ = 6646033469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6646036477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18359028 + ... + 18359389.

It is an arithmetic number, because the mean of its divisors is an integer number (1670688019).

Almost surely, 2^6646033477 is an apocalyptic number.

It is an amenable number.

6646033477 is a deficient number, since it is larger than the sum of its proper divisors (36718599).

6646033477 is a wasteful number, since it uses less digits than its factorization.

6646033477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36718598.

The product of its (nonzero) digits is 1524096, while the sum is 46.

The square root of 6646033477 is about 81523.2082109138. The cubic root of 6646033477 is about 1880.1283936946.

The spelling of 6646033477 in words is "six billion, six hundred forty-six million, thirty-three thousand, four hundred seventy-seven".