66665345 has 16 divisors (see below), whose sum is σ = 85432320. Its totient is φ = 49828800.

The previous prime is 66665341. The next prime is 66665359. The reversal of 66665345 is 54356666.

It is a happy number.

It is not a de Polignac number, because 66665345 - 2² = 66665341 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66665341) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2921 + ... + 11910.

It is an arithmetic number, because the mean of its divisors is an integer number (5339520).

Almost surely, 2^66665345 is an apocalyptic number.

It is an amenable number.

66665345 is a deficient number, since it is larger than the sum of its proper divisors (18766975).

66665345 is a wasteful number, since it uses less digits than its factorization.

66665345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14896.

The product of its digits is 388800, while the sum is 41.

The square root of 66665345 is about 8164.8848736525. The cubic root of 66665345 is about 405.4774534726.

The spelling of 66665345 in words is "sixty-six million, six hundred sixty-five thousand, three hundred forty-five".