66899655699866 has 48 divisors (see below), whose sum is σ = 116627197655808. Its totient is φ = 28444585449600.

The previous prime is 66899655699839. The next prime is 66899655699889.

66899655699866 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×66899655699866² (a number of 28 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6570551 + ... + 13303061.

It is an arithmetic number, because the mean of its divisors is an integer number (2429733284496).

Almost surely, 2^{66899655699866} is an apocalyptic number.

66899655699866 is a deficient number, since it is larger than the sum of its proper divisors (49727541955942).

66899655699866 is a wasteful number, since it uses less digits than its factorization.

66899655699866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6732867 (or 6732704 counting only the distinct ones).

The product of its digits is 489776025600, while the sum is 98.

The spelling of 66899655699866 in words is "sixty-six trillion, eight hundred ninety-nine billion, six hundred fifty-five million, six hundred ninety-nine thousand, eight hundred sixty-six".