66643207511 has 8 divisors (see below), whose sum is σ = 66702636000. Its totient is φ = 66583808800.

The previous prime is 66643207489. The next prime is 66643207517. The reversal of 66643207511 is 11570234666.

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 66643207511 - 2¹⁸ = 66642945367 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 (66643207517) 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, 7208630 + ... + 7217868.

It is an arithmetic number, because the mean of its divisors is an integer number (8337829500).

Almost surely, 2^66643207511 is an apocalyptic number.

66643207511 is a deficient number, since it is larger than the sum of its proper divisors (59428489).

66643207511 is a wasteful number, since it uses less digits than its factorization.

66643207511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14889.

The product of its (nonzero) digits is 181440, while the sum is 41.

The spelling of 66643207511 in words is "sixty-six billion, six hundred forty-three million, two hundred seven thousand, five hundred eleven".