66636111247 has 8 divisors (see below), whose sum is σ = 68062156992. Its totient is φ = 65210409600.

The previous prime is 66636111229. The next prime is 66636111253. The reversal of 66636111247 is 74211163666.

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 66636111247 - 2²³ = 66627722639 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 (66636111257) 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, 326347 + ... + 489667.

It is an arithmetic number, because the mean of its divisors is an integer number (8507769624).

Almost surely, 2^66636111247 is an apocalyptic number.

66636111247 is a deficient number, since it is larger than the sum of its proper divisors (1426045745).

66636111247 is a wasteful number, since it uses less digits than its factorization.

66636111247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172049.

The product of its digits is 217728, while the sum is 43.

The spelling of 66636111247 in words is "sixty-six billion, six hundred thirty-six million, one hundred eleven thousand, two hundred forty-seven".