66936929 has 4 divisors (see below), whose sum is σ = 67229460. Its totient is φ = 66644400.

The previous prime is 66936913. The next prime is 66936949. The reversal of 66936929 is 92963966.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 58369600 + 8567329 = 7640^2 + 2927^2 .

It is a cyclic number.

It is not a de Polignac number, because 66936929 - 2⁴ = 66936913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66936949) 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, 145922 + ... + 146379.

It is an arithmetic number, because the mean of its divisors is an integer number (16807365).

Almost surely, 2^66936929 is an apocalyptic number.

It is an amenable number.

66936929 is a deficient number, since it is larger than the sum of its proper divisors (292531).

66936929 is a wasteful number, since it uses less digits than its factorization.

66936929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 292530.

The product of its digits is 944784, while the sum is 50.

The square root of 66936929 is about 8181.4991902462. The cubic root of 66936929 is about 406.0273243114.

The spelling of 66936929 in words is "sixty-six million, nine hundred thirty-six thousand, nine hundred twenty-nine".