67211661 has 16 divisors (see below), whose sum is σ = 97950528. Its totient is φ = 40656000.

The previous prime is 67211629. The next prime is 67211687. The reversal of 67211661 is 16611276.

It is not a de Polignac number, because 67211661 - 2⁵ = 67211629 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67211161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18711 + ... + 22011.

It is an arithmetic number, because the mean of its divisors is an integer number (6121908).

Almost surely, 2^67211661 is an apocalyptic number.

It is an amenable number.

67211661 is a deficient number, since it is larger than the sum of its proper divisors (30738867).

67211661 is a wasteful number, since it uses less digits than its factorization.

67211661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3932.

The product of its digits is 3024, while the sum is 30.

The square root of 67211661 is about 8198.2718300871. The cubic root of 67211661 is about 406.5820576315.

The spelling of 67211661 in words is "sixty-seven million, two hundred eleven thousand, six hundred sixty-one".