66665433456666 has 96 divisors (see below), whose sum is σ = 160167661917120. Its totient is φ = 19869025593600.

The previous prime is 66665433456593. The next prime is 66665433456719.

66665433456666 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×66665433456666² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66665433456594 and 66665433456603.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 171833190 + ... + 172220718.

It is an arithmetic number, because the mean of its divisors is an integer number (1668413144970).

Almost surely, 2^{66665433456666} is an apocalyptic number.

66665433456666 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 66665433456666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80083830958560).

66665433456666 is an abundant number, since it is smaller than the sum of its proper divisors (93502228460454).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66665433456666 is a wasteful number, since it uses less digits than its factorization.

66665433456666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401852 (or 401849 counting only the distinct ones).

The product of its digits is 6046617600, while the sum is 72.

The spelling of 66665433456666 in words is "sixty-six trillion, six hundred sixty-five billion, four hundred thirty-three million, four hundred fifty-six thousand, six hundred sixty-six".