66421874175 has 24 divisors (see below), whose sum is σ = 109923936144. Its totient is φ = 35390664960.

The previous prime is 66421874149. The next prime is 66421874203. The reversal of 66421874175 is 57147812466.

It is not a de Polignac number, because 66421874175 - 2¹⁵ = 66421841407 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 351192 + ... + 506141.

It is an arithmetic number, because the mean of its divisors is an integer number (4580164006).

Almost surely, 2^66421874175 is an apocalyptic number.

66421874175 is a deficient number, since it is larger than the sum of its proper divisors (43502061969).

66421874175 is a wasteful number, since it uses less digits than its factorization.

66421874175 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 858379 (or 858374 counting only the distinct ones).

The product of its digits is 2257920, while the sum is 51.

The spelling of 66421874175 in words is "sixty-six billion, four hundred twenty-one million, eight hundred seventy-four thousand, one hundred seventy-five".