67220861 has 2 divisors, whose sum is σ = 67220862. Its totient is φ = 67220860.

The previous prime is 67220851. The next prime is 67220887. The reversal of 67220861 is 16802276.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 49420900 + 17799961 = 7030^2 + 4219^2 .

It is a cyclic number.

It is not a de Polignac number, because 67220861 - 2¹⁰ = 67219837 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67220851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33610430 + 33610431.

It is an arithmetic number, because the mean of its divisors is an integer number (33610431).

Almost surely, 2^67220861 is an apocalyptic number.

It is an amenable number.

67220861 is a deficient number, since it is larger than the sum of its proper divisors (1).

67220861 is an equidigital number, since it uses as much as digits as its factorization.

67220861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 67220861 is about 8198.8329047493. The cubic root of 67220861 is about 406.6006079060.

The spelling of 67220861 in words is "sixty-seven million, two hundred twenty thousand, eight hundred sixty-one".