666456769 has 8 divisors (see below), whose sum is σ = 729875808. Its totient is φ = 603509760.

The previous prime is 666456761. The next prime is 666456773. The reversal of 666456769 is 967654666.

666456769 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 666456769 - 2³ = 666456761 is a prime.

It is a super-2 number, since 2×666456769² = 888329249891838722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (666456761) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115047 + ... + 120700.

It is an arithmetic number, because the mean of its divisors is an integer number (91234476).

Almost surely, 2^666456769 is an apocalyptic number.

It is an amenable number.

666456769 is a deficient number, since it is larger than the sum of its proper divisors (63419039).

666456769 is a wasteful number, since it uses less digits than its factorization.

666456769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236015.

The product of its digits is 9797760, while the sum is 55.

The square root of 666456769 is about 25815.8240038934. The cubic root of 666456769 is about 873.4887738622.

The spelling of 666456769 in words is "six hundred sixty-six million, four hundred fifty-six thousand, seven hundred sixty-nine".