66934644643966 has 16 divisors (see below), whose sum is σ = 114291567139968. Its totient is φ = 29102019410200.

The previous prime is 66934644643927. The next prime is 66934644643981.

66934644643966 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×66934644643966² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66934644643892 and 66934644643901.

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, 66140952700 + ... + 66140953711.

It is an arithmetic number, because the mean of its divisors is an integer number (7143222946248).

Almost surely, 2^{66934644643966} is an apocalyptic number.

66934644643966 is a deficient number, since it is larger than the sum of its proper divisors (47356922496002).

66934644643966 is a wasteful number, since it uses less digits than its factorization.

66934644643966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132281906447.

The product of its digits is 8707129344, while the sum is 76.

The spelling of 66934644643966 in words is "sixty-six trillion, nine hundred thirty-four billion, six hundred forty-four million, six hundred forty-three thousand, nine hundred sixty-six".