6645477766 has 8 divisors (see below), whose sum is σ = 10104767784. Its totient is φ = 3277221840.

The previous prime is 6645477763. The next prime is 6645477767. The reversal of 6645477766 is 6677745466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 6645477766.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6645477763) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22758340 + ... + 22758631.

It is an arithmetic number, because the mean of its divisors is an integer number (1263095973).

Almost surely, 2^6645477766 is an apocalyptic number.

6645477766 is a deficient number, since it is larger than the sum of its proper divisors (3459290018).

6645477766 is a wasteful number, since it uses less digits than its factorization.

6645477766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45517046.

The product of its digits is 35562240, while the sum is 58.

The square root of 6645477766 is about 81519.7998402842. The cubic root of 6645477766 is about 1880.0759896476.

The spelling of 6645477766 in words is "six billion, six hundred forty-five million, four hundred seventy-seven thousand, seven hundred sixty-six".