66111667 has 8 divisors (see below), whose sum is σ = 66908880. Its totient is φ = 65318400.

The previous prime is 66111631. The next prime is 66111673. The reversal of 66111667 is 76611166.

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 66111667 - 2¹⁵ = 66078899 is a prime.

It is a super-3 number, since 3×66111667³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66111767) 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, 44584 + ... + 46042.

It is an arithmetic number, because the mean of its divisors is an integer number (8363610).

Almost surely, 2^66111667 is an apocalyptic number.

66111667 is a deficient number, since it is larger than the sum of its proper divisors (797213).

66111667 is a wasteful number, since it uses less digits than its factorization.

66111667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1973.

The product of its digits is 9072, while the sum is 34.

The square root of 66111667 is about 8130.9081288624. The cubic root of 66111667 is about 404.3517893762.

The spelling of 66111667 in words is "sixty-six million, one hundred eleven thousand, six hundred sixty-seven".