766666321 has 8 divisors (see below), whose sum is σ = 807602400. Its totient is φ = 725788800.

The previous prime is 766666319. The next prime is 766666333. The reversal of 766666321 is 123666667.

766666321 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 766666321 - 2¹ = 766666319 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (766664321) 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, 13665 + ... + 41473.

It is an arithmetic number, because the mean of its divisors is an integer number (100950300).

Almost surely, 2^766666321 is an apocalyptic number.

It is an amenable number.

766666321 is a deficient number, since it is larger than the sum of its proper divisors (40936079).

766666321 is a wasteful number, since it uses less digits than its factorization.

766666321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29279.

The product of its digits is 326592, while the sum is 43.

The square root of 766666321 is about 27688.7399677197. The cubic root of 766666321 is about 915.2409892076.

The spelling of 766666321 in words is "seven hundred sixty-six million, six hundred sixty-six thousand, three hundred twenty-one".