66401429 has 2 divisors, whose sum is σ = 66401430. Its totient is φ = 66401428.

The previous prime is 66401407. The next prime is 66401441. The reversal of 66401429 is 92410466.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53260804 + 13140625 = 7298^2 + 3625^2 .

It is a cyclic number.

It is not a de Polignac number, because 66401429 - 2¹² = 66397333 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 66401395 and 66401404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66401729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33200714 + 33200715.

It is an arithmetic number, because the mean of its divisors is an integer number (33200715).

Almost surely, 2^66401429 is an apocalyptic number.

It is an amenable number.

66401429 is a deficient number, since it is larger than the sum of its proper divisors (1).

66401429 is an equidigital number, since it uses as much as digits as its factorization.

66401429 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 66401429 is about 8148.7071980775. The cubic root of 66401429 is about 404.9416752874.

The spelling of 66401429 in words is "sixty-six million, four hundred one thousand, four hundred twenty-nine".