66543586901 has 8 divisors (see below), whose sum is σ = 72862869600. Its totient is φ = 60269281840.

The previous prime is 66543586891. The next prime is 66543586939. The reversal of 66543586901 is 10968534566.

It is a happy number.

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 66543586901 - 2²² = 66539392597 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 (66543586301) 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, 11241311 + ... + 11247228.

It is an arithmetic number, because the mean of its divisors is an integer number (9107858700).

Almost surely, 2^66543586901 is an apocalyptic number.

It is an amenable number.

66543586901 is a deficient number, since it is larger than the sum of its proper divisors (6319282699).

66543586901 is a wasteful number, since it uses less digits than its factorization.

66543586901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22488819.

The product of its (nonzero) digits is 4665600, while the sum is 53.

The spelling of 66543586901 in words is "sixty-six billion, five hundred forty-three million, five hundred eighty-six thousand, nine hundred one".