66423739 has 2 divisors, whose sum is σ = 66423740. Its totient is φ = 66423738.

The previous prime is 66423719. The next prime is 66423751. The reversal of 66423739 is 93732466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66423739 - 2⁷ = 66423611 is a prime.

It is a super-2 number, since 2×66423739² = 8824226205480242, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66423719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33211869 + 33211870.

It is an arithmetic number, because the mean of its divisors is an integer number (33211870).

Almost surely, 2^66423739 is an apocalyptic number.

66423739 is a deficient number, since it is larger than the sum of its proper divisors (1).

66423739 is an equidigital number, since it uses as much as digits as its factorization.

66423739 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 40.

The square root of 66423739 is about 8150.0760119155. The cubic root of 66423739 is about 404.9870218876.

The spelling of 66423739 in words is "sixty-six million, four hundred twenty-three thousand, seven hundred thirty-nine".