966664391 has 16 divisors (see below), whose sum is σ = 1207979520. Its totient is φ = 751502880.

The previous prime is 966664379. The next prime is 966664441. The reversal of 966664391 is 193466669.

966664391 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-966664391 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (966664301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19505 + ... + 48101.

It is an arithmetic number, because the mean of its divisors is an integer number (75498720).

Almost surely, 2^966664391 is an apocalyptic number.

966664391 is a deficient number, since it is larger than the sum of its proper divisors (241315129).

966664391 is a wasteful number, since it uses less digits than its factorization.

966664391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29054.

The product of its digits is 1259712, while the sum is 50.

The square root of 966664391 is about 31091.2269137131. The cubic root of 966664391 is about 988.7623178861.

The spelling of 966664391 in words is "nine hundred sixty-six million, six hundred sixty-four thousand, three hundred ninety-one".