66929725 has 12 divisors (see below), whose sum is σ = 84560436. Its totient is φ = 52532480.

The previous prime is 66929591. The next prime is 66929743. The reversal of 66929725 is 52792966.

It can be written as a sum of positive squares in 6 ways, for example, as 3790809 + 63138916 = 1947^2 + 7946^2 .

It is a de Polignac number, because none of the positive numbers 2^k-66929725 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23932 + ... + 26581.

It is an arithmetic number, because the mean of its divisors is an integer number (7046703).

Almost surely, 2^66929725 is an apocalyptic number.

It is an amenable number.

66929725 is a deficient number, since it is larger than the sum of its proper divisors (17630711).

66929725 is a wasteful number, since it uses less digits than its factorization.

66929725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50576 (or 50571 counting only the distinct ones).

The product of its digits is 408240, while the sum is 46.

The square root of 66929725 is about 8181.0589167907. The cubic root of 66929725 is about 406.0127577345.

The spelling of 66929725 in words is "sixty-six million, nine hundred twenty-nine thousand, seven hundred twenty-five".