67309661 has 4 divisors (see below), whose sum is σ = 70236192. Its totient is φ = 64383132.

The previous prime is 67309643. The next prime is 67309673. The reversal of 67309661 is 16690376.

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 a cyclic number.

It is not a de Polignac number, because 67309661 - 2¹⁴ = 67293277 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67309621) 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, 1463231 + ... + 1463276.

It is an arithmetic number, because the mean of its divisors is an integer number (17559048).

Almost surely, 2^67309661 is an apocalyptic number.

It is an amenable number.

67309661 is a deficient number, since it is larger than the sum of its proper divisors (2926531).

67309661 is a wasteful number, since it uses less digits than its factorization.

67309661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2926530.

The product of its (nonzero) digits is 40824, while the sum is 38.

The square root of 67309661 is about 8204.2465223810. The cubic root of 67309661 is about 406.7795714308.

The spelling of 67309661 in words is "sixty-seven million, three hundred nine thousand, six hundred sixty-one".