66167667 has 6 divisors (see below), whose sum is σ = 95575532. Its totient is φ = 44111772.

The previous prime is 66167663. The next prime is 66167693. The reversal of 66167667 is 76676166.

It is not a de Polignac number, because 66167667 - 2² = 66167663 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66167663) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3675973 + ... + 3675990.

Almost surely, 2^66167667 is an apocalyptic number.

66167667 is a deficient number, since it is larger than the sum of its proper divisors (29407865).

66167667 is a wasteful number, since it uses less digits than its factorization.

66167667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7351969 (or 7351966 counting only the distinct ones).

The product of its digits is 381024, while the sum is 45.

The square root of 66167667 is about 8134.3510497150. The cubic root of 66167667 is about 404.4659261127.

The spelling of 66167667 in words is "sixty-six million, one hundred sixty-seven thousand, six hundred sixty-seven".