66705029 has 4 divisors (see below), whose sum is σ = 70215840. Its totient is φ = 63194220.

The previous prime is 66705019. The next prime is 66705047. The reversal of 66705029 is 92050766.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 92050766 = 2 ⋅46025383.

It is a cyclic number.

It is not a de Polignac number, because 66705029 - 2⁴ = 66705013 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66705029.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66705019) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1755377 + ... + 1755414.

It is an arithmetic number, because the mean of its divisors is an integer number (17553960).

Almost surely, 2^66705029 is an apocalyptic number.

It is an amenable number.

66705029 is a deficient number, since it is larger than the sum of its proper divisors (3510811).

66705029 is a wasteful number, since it uses less digits than its factorization.

66705029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3510810.

The product of its (nonzero) digits is 22680, while the sum is 35.

The square root of 66705029 is about 8167.3146749712. The cubic root of 66705029 is about 405.5578939448.

The spelling of 66705029 in words is "sixty-six million, seven hundred five thousand, twenty-nine".