6645555466 has 12 divisors (see below), whose sum is σ = 10956928626. Its totient is φ = 3020706920.

The previous prime is 6645555437. The next prime is 6645555487.

6645555466 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in only one way, i.e., 4819275241 + 1826280225 = 69421^2 + 42735^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13730245 + ... + 13730728.

Almost surely, 2^6645555466 is an apocalyptic number.

6645555466 is a deficient number, since it is larger than the sum of its proper divisors (4311373160).

6645555466 is a wasteful number, since it uses less digits than its factorization.

6645555466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27460997 (or 27460986 counting only the distinct ones).

The product of its digits is 12960000, while the sum is 52.

The square root of 6645555466 is about 81520.2764102281. The cubic root of 6645555466 is about 1880.0833170032.

The spelling of 6645555466 in words is "six billion, six hundred forty-five million, five hundred fifty-five thousand, four hundred sixty-six".