67661171 has 2 divisors, whose sum is σ = 67661172. Its totient is φ = 67661170.

The previous prime is 67661117. The next prime is 67661201. The reversal of 67661171 is 17116676.

Together with previous prime (67661117) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67661171 is a prime.

It is a super-2 number, since 2×67661171² = 9156068122182482, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (67661371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33830585 + 33830586.

It is an arithmetic number, because the mean of its divisors is an integer number (33830586).

Almost surely, 2^67661171 is an apocalyptic number.

67661171 is a deficient number, since it is larger than the sum of its proper divisors (1).

67661171 is an equidigital number, since it uses as much as digits as its factorization.

67661171 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10584, while the sum is 35.

The square root of 67661171 is about 8225.6410692420. The cubic root of 67661171 is about 407.4864481674.

The spelling of 67661171 in words is "sixty-seven million, six hundred sixty-one thousand, one hundred seventy-one".