7800866666 has 8 divisors (see below), whose sum is σ = 11711161440. Its totient is φ = 3897146188.

The previous prime is 7800866659. The next prime is 7800866683. The reversal of 7800866666 is 6666680087.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1640606 + ... + 1645353.

It is an arithmetic number, because the mean of its divisors is an integer number (1463895180).

Almost surely, 2^7800866666 is an apocalyptic number.

7800866666 is a deficient number, since it is larger than the sum of its proper divisors (3910294774).

7800866666 is a wasteful number, since it uses less digits than its factorization.

7800866666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3287148.

The product of its (nonzero) digits is 3483648, while the sum is 53.

The square root of 7800866666 is about 88322.5150570340. The cubic root of 7800866666 is about 1983.2659314774.

The spelling of 7800866666 in words is "seven billion, eight hundred million, eight hundred sixty-six thousand, six hundred sixty-six".