66652729 has 12 divisors (see below), whose sum is σ = 78900388. Its totient is φ = 55931040.

The previous prime is 66652673. The next prime is 66652753. The reversal of 66652729 is 92725666.

It can be written as a sum of positive squares in 2 ways, for example, as 6512704 + 60140025 = 2552^2 + 7755^2 .

It is not a de Polignac number, because 66652729 - 2⁷ = 66652601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66652769) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19614 + ... + 22759.

Almost surely, 2^66652729 is an apocalyptic number.

It is an amenable number.

66652729 is a deficient number, since it is larger than the sum of its proper divisors (12247659).

66652729 is a wasteful number, since it uses less digits than its factorization.

66652729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42408 (or 42397 counting only the distinct ones).

The product of its digits is 272160, while the sum is 43.

The square root of 66652729 is about 8164.1122603747. The cubic root of 66652729 is about 405.4518738341.

The spelling of 66652729 in words is "sixty-six million, six hundred fifty-two thousand, seven hundred twenty-nine".