6667626665 has 16 divisors (see below), whose sum is σ = 9175396608. Its totient is φ = 4556475456.

The previous prime is 6667626631. The next prime is 6667626671. The reversal of 6667626665 is 5666267666.

It is a cyclic number.

It is not a de Polignac number, because 6667626665 - 2²⁴ = 6650849449 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 6667626665.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 314837 + ... + 335346.

It is an arithmetic number, because the mean of its divisors is an integer number (573462288).

Almost surely, 2^6667626665 is an apocalyptic number.

It is an amenable number.

6667626665 is a deficient number, since it is larger than the sum of its proper divisors (2507769943).

6667626665 is a wasteful number, since it uses less digits than its factorization.

6667626665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 650488.

The product of its digits is 19595520, while the sum is 56.

The square root of 6667626665 is about 81655.5366463291. The cubic root of 6667626665 is about 1882.1623927281.

The spelling of 6667626665 in words is "six billion, six hundred sixty-seven million, six hundred twenty-six thousand, six hundred sixty-five".