66634167873 has 240 divisors, whose sum is σ = 122691866880. Its totient is φ = 32038022016.

The previous prime is 66634167863. The next prime is 66634167877. The reversal of 66634167873 is 37876143666.

66634167873 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66634167873 - 2¹⁰ = 66634166849 is a prime.

It is a super-2 number, since 2×66634167873² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is not an unprimeable number, because it can be changed into a prime (66634167877) by changing a digit.

It is a polite number, since it can be written in 239 ways as a sum of consecutive naturals, for example, 994539786 + ... + 994539852.

It is an arithmetic number, because the mean of its divisors is an integer number (511216112).

Almost surely, 2^66634167873 is an apocalyptic number.

It is an amenable number.

66634167873 is a deficient number, since it is larger than the sum of its proper divisors (56057699007).

66634167873 is a wasteful number, since it uses less digits than its factorization.

66634167873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186 (or 152 counting only the distinct ones).

The product of its digits is 18289152, while the sum is 57.

The spelling of 66634167873 in words is "sixty-six billion, six hundred thirty-four million, one hundred sixty-seven thousand, eight hundred seventy-three".