66899907 has 6 divisors (see below), whose sum is σ = 96633212. Its totient is φ = 44599932.

The previous prime is 66899887. The next prime is 66899933. The reversal of 66899907 is 70999866.

It is not a de Polignac number, because 66899907 - 2¹² = 66895811 is a prime.

It is a Duffinian number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (66899407) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3716653 + ... + 3716670.

Almost surely, 2^66899907 is an apocalyptic number.

66899907 is a deficient number, since it is larger than the sum of its proper divisors (29733305).

66899907 is a wasteful number, since it uses less digits than its factorization.

66899907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7433329 (or 7433326 counting only the distinct ones).

The product of its (nonzero) digits is 1469664, while the sum is 54.

The square root of 66899907 is about 8179.2363335461. The cubic root of 66899907 is about 405.9524542509.

The spelling of 66899907 in words is "sixty-six million, eight hundred ninety-nine thousand, nine hundred seven".