7645280666 has 8 divisors (see below), whose sum is σ = 11480911104. Its totient is φ = 3818310300.

The previous prime is 7645280653. The next prime is 7645280677. The reversal of 7645280666 is 6660825467.

It is a happy number.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2162810 + ... + 2166341.

It is an arithmetic number, because the mean of its divisors is an integer number (1435113888).

Almost surely, 2^7645280666 is an apocalyptic number.

7645280666 is a deficient number, since it is larger than the sum of its proper divisors (3835630438).

7645280666 is a wasteful number, since it uses less digits than its factorization.

7645280666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4330036.

The product of its (nonzero) digits is 2903040, while the sum is 50.

The square root of 7645280666 is about 87437.2956237783. The cubic root of 7645280666 is about 1969.9920693334.

The spelling of 7645280666 in words is "seven billion, six hundred forty-five million, two hundred eighty thousand, six hundred sixty-six".