67666361 has 4 divisors (see below), whose sum is σ = 77332992. Its totient is φ = 57999732.

The previous prime is 67666351. The next prime is 67666363. The reversal of 67666361 is 16366676.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 67666361 - 2⁶ = 67666297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67666363) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4833305 + ... + 4833318.

It is an arithmetic number, because the mean of its divisors is an integer number (19333248).

Almost surely, 2^67666361 is an apocalyptic number.

It is an amenable number.

67666361 is a deficient number, since it is larger than the sum of its proper divisors (9666631).

67666361 is an equidigital number, since it uses as much as digits as its factorization.

67666361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9666630.

The product of its digits is 163296, while the sum is 41.

The square root of 67666361 is about 8225.9565401235. The cubic root of 67666361 is about 407.4968667505.

The spelling of 67666361 in words is "sixty-seven million, six hundred sixty-six thousand, three hundred sixty-one".