6664701291 has 8 divisors (see below), whose sum is σ = 8887967184. Its totient is φ = 4442284800.

The previous prime is 6664701289. The next prime is 6664701313. The reversal of 6664701291 is 1921074666.

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

It is not a de Polignac number, because 6664701291 - 2¹ = 6664701289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6664701691) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 193810 + ... + 225591.

It is an arithmetic number, because the mean of its divisors is an integer number (1110995898).

Almost surely, 2^6664701291 is an apocalyptic number.

6664701291 is a deficient number, since it is larger than the sum of its proper divisors (2223265893).

6664701291 is a wasteful number, since it uses less digits than its factorization.

6664701291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424701.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 6664701291 is about 81637.6217867718. The cubic root of 6664701291 is about 1881.8870906531.

The spelling of 6664701291 in words is "six billion, six hundred sixty-four million, seven hundred one thousand, two hundred ninety-one".