66311723 has 2 divisors, whose sum is σ = 66311724. Its totient is φ = 66311722.

The previous prime is 66311701. The next prime is 66311743. The reversal of 66311723 is 32711366.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66311723 - 2¹² = 66307627 is a prime.

It is not a weakly prime, because it can be changed into another prime (66311743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33155861 + 33155862.

It is an arithmetic number, because the mean of its divisors is an integer number (33155862).

Almost surely, 2^66311723 is an apocalyptic number.

66311723 is a deficient number, since it is larger than the sum of its proper divisors (1).

66311723 is an equidigital number, since it uses as much as digits as its factorization.

66311723 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536, while the sum is 29.

The square root of 66311723 is about 8143.2010290794. The cubic root of 66311723 is about 404.7592391109.

The spelling of 66311723 in words is "sixty-six million, three hundred eleven thousand, seven hundred twenty-three".