66429791 has 2 divisors, whose sum is σ = 66429792. Its totient is φ = 66429790.

The previous prime is 66429767. The next prime is 66429809. The reversal of 66429791 is 19792466.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66429791 - 2¹⁰ = 66428767 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66429721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33214895 + 33214896.

It is an arithmetic number, because the mean of its divisors is an integer number (33214896).

Almost surely, 2^66429791 is an apocalyptic number.

66429791 is a deficient number, since it is larger than the sum of its proper divisors (1).

66429791 is an equidigital number, since it uses as much as digits as its factorization.

66429791 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 44.

The square root of 66429791 is about 8150.4472883395. The cubic root of 66429791 is about 404.9993212405. Note that the first 3 decimals are identical.

The spelling of 66429791 in words is "sixty-six million, four hundred twenty-nine thousand, seven hundred ninety-one".