66173400734 has 24 divisors (see below), whose sum is σ = 115555630320. Its totient is φ = 28337973216.

The previous prime is 66173400731. The next prime is 66173400749. The reversal of 66173400734 is 43700437166.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 66173400691 and 66173400700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66173400731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 135602 + ... + 388245.

It is an arithmetic number, because the mean of its divisors is an integer number (4814817930).

Almost surely, 2^66173400734 is an apocalyptic number.

66173400734 is a deficient number, since it is larger than the sum of its proper divisors (49382229586).

66173400734 is a wasteful number, since it uses less digits than its factorization.

66173400734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 525152 (or 525145 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 41.

The spelling of 66173400734 in words is "sixty-six billion, one hundred seventy-three million, four hundred thousand, seven hundred thirty-four".