67666433 has 4 divisors (see below), whose sum is σ = 68426820. Its totient is φ = 66906048.

The previous prime is 67666411. The next prime is 67666453. The reversal of 67666433 is 33466676.

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

It can be written as a sum of positive squares in 2 ways, for example, as 32001649 + 35664784 = 5657^2 + 5972^2 .

It is a cyclic number.

It is not a de Polignac number, because 67666433 - 2¹² = 67662337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67666453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 380060 + ... + 380237.

It is an arithmetic number, because the mean of its divisors is an integer number (17106705).

Almost surely, 2^67666433 is an apocalyptic number.

It is an amenable number.

67666433 is a deficient number, since it is larger than the sum of its proper divisors (760387).

67666433 is an equidigital number, since it uses as much as digits as its factorization.

67666433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 760386.

The product of its digits is 326592, while the sum is 41.

The square root of 67666433 is about 8225.9609165130. The cubic root of 67666433 is about 407.4970112820.

The spelling of 67666433 in words is "sixty-seven million, six hundred sixty-six thousand, four hundred thirty-three".