66967971 has 8 divisors (see below), whose sum is σ = 102046464. Its totient is φ = 38267400.

The previous prime is 66967939. The next prime is 66967987. The reversal of 66967971 is 17976966.

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

It is not a de Polignac number, because 66967971 - 2⁵ = 66967939 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66967921) 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, 1594455 + ... + 1594496.

It is an arithmetic number, because the mean of its divisors is an integer number (12755808).

Almost surely, 2^66967971 is an apocalyptic number.

66967971 is a deficient number, since it is larger than the sum of its proper divisors (35078493).

66967971 is a wasteful number, since it uses less digits than its factorization.

66967971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3188961.

The product of its digits is 857304, while the sum is 51.

The square root of 66967971 is about 8183.3960554283. The cubic root of 66967971 is about 406.0900796671.

The spelling of 66967971 in words is "sixty-six million, nine hundred sixty-seven thousand, nine hundred seventy-one".