67221665 has 16 divisors (see below), whose sum is σ = 92596608. Its totient is φ = 45891456.

The previous prime is 67221647. The next prime is 67221701. The reversal of 67221665 is 56612276.

It is a cyclic number.

It is not a de Polignac number, because 67221665 - 2¹⁰ = 67220641 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4034 + ... + 12276.

It is an arithmetic number, because the mean of its divisors is an integer number (5787288).

Almost surely, 2^67221665 is an apocalyptic number.

It is an amenable number.

67221665 is a deficient number, since it is larger than the sum of its proper divisors (25374943).

67221665 is a wasteful number, since it uses less digits than its factorization.

67221665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8488.

The product of its digits is 30240, while the sum is 35.

The square root of 67221665 is about 8198.8819359715. The cubic root of 67221665 is about 406.6022289583.

The spelling of 67221665 in words is "sixty-seven million, two hundred twenty-one thousand, six hundred sixty-five".