66916861966 has 16 divisors (see below), whose sum is σ = 107735612544. Its totient is φ = 31058913024.

The previous prime is 66916861961. The next prime is 66916861997.

66916861966 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 66916861898 and 66916861907.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66916861961) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13477950 + ... + 13482913.

It is an arithmetic number, because the mean of its divisors is an integer number (6733475784).

Almost surely, 2^66916861966 is an apocalyptic number.

66916861966 is a deficient number, since it is larger than the sum of its proper divisors (40818750578).

66916861966 is a wasteful number, since it uses less digits than its factorization.

66916861966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26960955.

The product of its digits is 30233088, while the sum is 64.

The spelling of 66916861966 in words is "sixty-six billion, nine hundred sixteen million, eight hundred sixty-one thousand, nine hundred sixty-six".