67166399 has 4 divisors (see below), whose sum is σ = 67184640. Its totient is φ = 67148160.

The previous prime is 67166383. The next prime is 67166413. The reversal of 67166399 is 99366176.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 67166399 - 2⁴ = 67166383 is a prime.

It is a super-2 number, since 2×67166399² = 9022650309254402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67166299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1442 + ... + 11679.

It is an arithmetic number, because the mean of its divisors is an integer number (16796160).

Almost surely, 2^67166399 is an apocalyptic number.

67166399 is a deficient number, since it is larger than the sum of its proper divisors (18241).

67166399 is a wasteful number, since it uses less digits than its factorization.

67166399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18240.

The product of its digits is 367416, while the sum is 47.

The square root of 67166399 is about 8195.5109053676. The cubic root of 67166399 is about 406.4907696551.

The spelling of 67166399 in words is "sixty-seven million, one hundred sixty-six thousand, three hundred ninety-nine".