666475703691 has 8 divisors (see below), whose sum is σ = 1015582024704. Its totient is φ = 380843259240.

The previous prime is 666475703683. The next prime is 666475703711. The reversal of 666475703691 is 196307574666.

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

It is not a de Polignac number, because 666475703691 - 2³ = 666475703683 is a prime.

It is a super-2 number, since 2×666475703691² (a number of 24 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (666475703651) 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, 15868469115 + ... + 15868469156.

It is an arithmetic number, because the mean of its divisors is an integer number (126947753088).

Almost surely, 2^666475703691 is an apocalyptic number.

666475703691 is a deficient number, since it is larger than the sum of its proper divisors (349106321013).

666475703691 is a wasteful number, since it uses less digits than its factorization.

666475703691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31736938281.

The product of its (nonzero) digits is 34292160, while the sum is 60.

The spelling of 666475703691 in words is "six hundred sixty-six billion, four hundred seventy-five million, seven hundred three thousand, six hundred ninety-one".