67166021 has 8 divisors (see below), whose sum is σ = 72495360. Its totient is φ = 61859952.

The previous prime is 67166009. The next prime is 67166081. The reversal of 67166021 is 12066176.

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 67166021 - 2¹⁰ = 67164997 is a prime.

It is a super-2 number, since 2×67166021² = 9022548753944882, 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 (67166081) 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 7 ways as a sum of consecutive naturals, for example, 440 + ... + 11598.

It is an arithmetic number, because the mean of its divisors is an integer number (9061920).

Almost surely, 2^67166021 is an apocalyptic number.

It is an amenable number.

67166021 is a deficient number, since it is larger than the sum of its proper divisors (5329339).

67166021 is a wasteful number, since it uses less digits than its factorization.

67166021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11635.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 67166021 is about 8195.4878439297. The cubic root of 67166021 is about 406.4900071021.

The spelling of 67166021 in words is "sixty-seven million, one hundred sixty-six thousand, twenty-one".