66465729 has 24 divisors (see below), whose sum is σ = 105019200. Its totient is φ = 40172640.

The previous prime is 66465719. The next prime is 66465739. The reversal of 66465729 is 92756466.

It is an interprime number because it is at equal distance from previous prime (66465719) and next prime (66465739).

It is not a de Polignac number, because 66465729 - 2¹⁹ = 65941441 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66465719) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 49732 + ... + 51050.

It is an arithmetic number, because the mean of its divisors is an integer number (4375800).

Almost surely, 2^66465729 is an apocalyptic number.

It is an amenable number.

66465729 is a deficient number, since it is larger than the sum of its proper divisors (38553471).

66465729 is a wasteful number, since it uses less digits than its factorization.

66465729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1845 (or 1842 counting only the distinct ones).

The product of its digits is 544320, while the sum is 45.

The square root of 66465729 is about 8152.6516545232. The cubic root of 66465729 is about 405.0723419013.

The spelling of 66465729 in words is "sixty-six million, four hundred sixty-five thousand, seven hundred twenty-nine".