66809050475 has 12 divisors (see below), whose sum is σ = 86445102576. Its totient is φ = 51123446880.

The previous prime is 66809050453. The next prime is 66809050531. The reversal of 66809050475 is 57405090866.

It is not a de Polignac number, because 66809050475 - 2¹⁴ = 66809034091 is a prime.

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 58094252 + ... + 58095401.

It is an arithmetic number, because the mean of its divisors is an integer number (7203758548).

Almost surely, 2^66809050475 is an apocalyptic number.

66809050475 is a deficient number, since it is larger than the sum of its proper divisors (19636052101).

66809050475 is a wasteful number, since it uses less digits than its factorization.

66809050475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116189686 (or 116189681 counting only the distinct ones).

The product of its (nonzero) digits is 1814400, while the sum is 50.

The spelling of 66809050475 in words is "sixty-six billion, eight hundred nine million, fifty thousand, four hundred seventy-five".