66698244289666 has 16 divisors (see below), whose sum is σ = 110992455830880. Its totient is φ = 29803529805280.

The previous prime is 66698244289643. The next prime is 66698244289667.

66698244289666 is nontrivially palindromic in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 66698244289666.

It is not an unprimeable number, because it can be changed into a prime (66698244289667) 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, 25692696811 + ... + 25692699406.

It is an arithmetic number, because the mean of its divisors is an integer number (6937028489430).

Almost surely, 2^{66698244289666} is an apocalyptic number.

66698244289666 is a deficient number, since it is larger than the sum of its proper divisors (44294211541214).

66698244289666 is a wasteful number, since it uses less digits than its factorization.

66698244289666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51385396289.

The product of its digits is 15479341056, while the sum is 82.

The spelling of 66698244289666 in words is "sixty-six trillion, six hundred ninety-eight billion, two hundred forty-four million, two hundred eighty-nine thousand, six hundred sixty-six".