66973666637966 has 16 divisors (see below), whose sum is σ = 109595873104560. Its totient is φ = 30441853404480.

The previous prime is 66973666637909. The next prime is 66973666638023.

It is a happy number.

66973666637966 is nontrivially palindromic in base 10.

It is an interprime number because it is at equal distance from previous prime (66973666637909) and next prime (66973666638023).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35168201 + ... + 37023636.

It is an arithmetic number, because the mean of its divisors is an integer number (6849742069035).

Almost surely, 2^{66973666637966} is an apocalyptic number.

66973666637966 is a deficient number, since it is larger than the sum of its proper divisors (42622206466594).

66973666637966 is a wasteful number, since it uses less digits than its factorization.

66973666637966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72234019.

The product of its digits is 59997563136, while the sum is 86.

The spelling of 66973666637966 in words is "sixty-six trillion, nine hundred seventy-three billion, six hundred sixty-six million, six hundred thirty-seven thousand, nine hundred sixty-six".