66660567 has 8 divisors (see below), whose sum is σ = 88918896. Its totient is φ = 44421312.

The previous prime is 66660563. The next prime is 66660613. The reversal of 66660567 is 76506666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66660567 - 2² = 66660563 is a prime.

It is a super-2 number, since 2×66660567² = 8887262385522978, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66660563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9433 + ... + 14909.

It is an arithmetic number, because the mean of its divisors is an integer number (11114862).

Almost surely, 2^66660567 is an apocalyptic number.

66660567 is a deficient number, since it is larger than the sum of its proper divisors (22258329).

66660567 is a wasteful number, since it uses less digits than its factorization.

66660567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9537.

The product of its (nonzero) digits is 272160, while the sum is 42.

The square root of 66660567 is about 8164.5922739596. The cubic root of 66660567 is about 405.4677661928.

The spelling of 66660567 in words is "sixty-six million, six hundred sixty thousand, five hundred sixty-seven".