66607893 has 32 divisors (see below), whose sum is σ = 108501120. Its totient is φ = 40049280.

The previous prime is 66607889. The next prime is 66607907. The reversal of 66607893 is 39870666.

It is not a de Polignac number, because 66607893 - 2² = 66607889 is a prime.

It is a super-2 number, since 2×66607893² = 8873222819798898, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66607813) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39871 + ... + 41507.

It is an arithmetic number, because the mean of its divisors is an integer number (3390660).

Almost surely, 2^66607893 is an apocalyptic number.

It is an amenable number.

66607893 is a deficient number, since it is larger than the sum of its proper divisors (41893227).

66607893 is a wasteful number, since it uses less digits than its factorization.

66607893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1794 (or 1788 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The square root of 66607893 is about 8161.3658783319. The cubic root of 66607893 is about 405.3609402335.

The spelling of 66607893 in words is "sixty-six million, six hundred seven thousand, eight hundred ninety-three".