66697612 has 12 divisors (see below), whose sum is σ = 118699560. Its totient is φ = 32783456.

The previous prime is 66697597. The next prime is 66697633. The reversal of 66697612 is 21679666.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 141073 + ... + 141544.

It is an arithmetic number, because the mean of its divisors is an integer number (9891630).

Almost surely, 2^66697612 is an apocalyptic number.

It is an amenable number.

66697612 is a deficient number, since it is larger than the sum of its proper divisors (52001948).

66697612 is a wasteful number, since it uses less digits than its factorization.

66697612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282680 (or 282678 counting only the distinct ones).

The product of its digits is 163296, while the sum is 43.

The square root of 66697612 is about 8166.8605963369. The cubic root of 66697612 is about 405.5428619228.

The spelling of 66697612 in words is "sixty-six million, six hundred ninety-seven thousand, six hundred twelve".