66869723 has 2 divisors, whose sum is σ = 66869724. Its totient is φ = 66869722.

The previous prime is 66869689. The next prime is 66869741. The reversal of 66869723 is 32796866.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66869723 - 2⁶ = 66869659 is a prime.

It is not a weakly prime, because it can be changed into another prime (66869783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33434861 + 33434862.

It is an arithmetic number, because the mean of its divisors is an integer number (33434862).

Almost surely, 2^66869723 is an apocalyptic number.

66869723 is a deficient number, since it is larger than the sum of its proper divisors (1).

66869723 is an equidigital number, since it uses as much as digits as its factorization.

66869723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 653184, while the sum is 47.

The square root of 66869723 is about 8177.3909653385. The cubic root of 66869723 is about 405.8913923217.

The spelling of 66869723 in words is "sixty-six million, eight hundred sixty-nine thousand, seven hundred twenty-three".