66111723 has 12 divisors (see below), whose sum is σ = 97297200. Its totient is φ = 43242576.

The previous prime is 66111719. The next prime is 66111733. The reversal of 66111723 is 32711166.

It is not a de Polignac number, because 66111723 - 2² = 66111719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66111733) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 68823 + ... + 69776.

It is an arithmetic number, because the mean of its divisors is an integer number (8108100).

Almost surely, 2^66111723 is an apocalyptic number.

66111723 is a deficient number, since it is larger than the sum of its proper divisors (31185477).

66111723 is a wasteful number, since it uses less digits than its factorization.

66111723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138658 (or 138655 counting only the distinct ones).

The product of its digits is 1512, while the sum is 27.

The square root of 66111723 is about 8130.9115725114. The cubic root of 66111723 is about 404.3519035451.

Adding to 66111723 its reverse (32711166), we get a palindrome (98822889).

The spelling of 66111723 in words is "sixty-six million, one hundred eleven thousand, seven hundred twenty-three".