66695890775 has 12 divisors (see below), whose sum is σ = 82828422600. Its totient is φ = 53275733280.

The previous prime is 66695890739. The next prime is 66695890783. The reversal of 66695890775 is 57709859666.

It is not a de Polignac number, because 66695890775 - 2⁸ = 66695890519 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2007680 + ... + 2040629.

It is an arithmetic number, because the mean of its divisors is an integer number (6902368550).

Almost surely, 2^66695890775 is an apocalyptic number.

66695890775 is a deficient number, since it is larger than the sum of its proper divisors (16132531825).

66695890775 is a wasteful number, since it uses less digits than its factorization.

66695890775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4048978 (or 4048973 counting only the distinct ones).

The product of its (nonzero) digits is 171460800, while the sum is 68.

The spelling of 66695890775 in words is "sixty-six billion, six hundred ninety-five million, eight hundred ninety thousand, seven hundred seventy-five".