73121666 has 8 divisors (see below), whose sum is σ = 110057724. Its totient is φ = 36435760.

The previous prime is 73121663. The next prime is 73121683. The reversal of 73121666 is 66612137.

It can be written as a sum of positive squares in 2 ways, for example, as 65141041 + 7980625 = 8071^2 + 2825^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (73121663) 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, 61805 + ... + 62976.

Almost surely, 2^73121666 is an apocalyptic number.

73121666 is a deficient number, since it is larger than the sum of its proper divisors (36936058).

73121666 is a wasteful number, since it uses less digits than its factorization.

73121666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125076.

The product of its digits is 9072, while the sum is 32.

The square root of 73121666 is about 8551.1207452591. The cubic root of 73121666 is about 418.1659750055.

The spelling of 73121666 in words is "seventy-three million, one hundred twenty-one thousand, six hundred sixty-six".