666734475845 has 8 divisors (see below), whose sum is σ = 809071049880. Its totient is φ = 527394461440.

The previous prime is 666734475829. The next prime is 666734475851. The reversal of 666734475845 is 548574437666.

It can be written as a sum of positive squares in 4 ways, for example, as 11798738884 + 654935736961 = 108622^2 + 809281^2 .

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

It is not a de Polignac number, because 666734475845 - 2⁴ = 666734475829 is a prime.

It is a super-2 number, since 2×666734475845² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 749139416 + ... + 749140305.

It is an arithmetic number, because the mean of its divisors is an integer number (101133881235).

Almost surely, 2^666734475845 is an apocalyptic number.

It is an amenable number.

666734475845 is a deficient number, since it is larger than the sum of its proper divisors (142336574035).

666734475845 is a wasteful number, since it uses less digits than its factorization.

666734475845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1498279815.

The product of its digits is 406425600, while the sum is 65.

The spelling of 666734475845 in words is "six hundred sixty-six billion, seven hundred thirty-four million, four hundred seventy-five thousand, eight hundred forty-five".