67666071 has 8 divisors (see below), whose sum is σ = 98423424. Its totient is φ = 41009720.

The previous prime is 67666063. The next prime is 67666099. The reversal of 67666071 is 17066676.

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 67666071 - 2³ = 67666063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67666021) 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, 1025211 + ... + 1025276.

It is an arithmetic number, because the mean of its divisors is an integer number (12302928).

Almost surely, 2^67666071 is an apocalyptic number.

67666071 is a deficient number, since it is larger than the sum of its proper divisors (30757353).

67666071 is a wasteful number, since it uses less digits than its factorization.

67666071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2050501.

The product of its (nonzero) digits is 63504, while the sum is 39.

The square root of 67666071 is about 8225.9389129752. The cubic root of 67666071 is about 407.4962846086.

The spelling of 67666071 in words is "sixty-seven million, six hundred sixty-six thousand, seventy-one".