66575567 has 8 divisors (see below), whose sum is σ = 68431440. Its totient is φ = 64733760.

The previous prime is 66575549. The next prime is 66575573. The reversal of 66575567 is 76557566.

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

It is a cyclic number.

It is not a de Polignac number, because 66575567 - 2¹² = 66571471 is a prime.

It is a super-2 number, since 2×66575567² = 8864612242742978, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66571567) 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, 6467 + ... + 13227.

It is an arithmetic number, because the mean of its divisors is an integer number (8553930).

Almost surely, 2^66575567 is an apocalyptic number.

66575567 is a deficient number, since it is larger than the sum of its proper divisors (1855873).

66575567 is a wasteful number, since it uses less digits than its factorization.

66575567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7033.

The product of its digits is 1323000, while the sum is 47.

The square root of 66575567 is about 8159.3852096834. The cubic root of 66575567 is about 405.2953533210.

The spelling of 66575567 in words is "sixty-six million, five hundred seventy-five thousand, five hundred sixty-seven".