66643340101 has 8 divisors (see below), whose sum is σ = 72145511424. Its totient is φ = 61194848880.

The previous prime is 66643340063. The next prime is 66643340131. The reversal of 66643340101 is 10104334666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66643340101 - 2⁹ = 66643339589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66643340131) 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, 13417441 + ... + 13422406.

It is an arithmetic number, because the mean of its divisors is an integer number (9018188928).

Almost surely, 2^66643340101 is an apocalyptic number.

It is an amenable number.

66643340101 is a deficient number, since it is larger than the sum of its proper divisors (5502171323).

66643340101 is a wasteful number, since it uses less digits than its factorization.

66643340101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26840051.

The product of its (nonzero) digits is 31104, while the sum is 34.

Adding to 66643340101 its reverse (10104334666), we get a palindrome (76747674767).

The spelling of 66643340101 in words is "sixty-six billion, six hundred forty-three million, three hundred forty thousand, one hundred one".