73961666 has 4 divisors (see below), whose sum is σ = 110942502. Its totient is φ = 36980832.

The previous prime is 73961639. The next prime is 73961669. The reversal of 73961666 is 66616937.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66616937 = 173 ⋅385069.

It can be written as a sum of positive squares in only one way, i.e., 61858225 + 12103441 = 7865^2 + 3479^2 .

It is not an unprimeable number, because it can be changed into a prime (73961669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18490415 + ... + 18490418.

Almost surely, 2^73961666 is an apocalyptic number.

73961666 is a deficient number, since it is larger than the sum of its proper divisors (36980836).

73961666 is a wasteful number, since it uses less digits than its factorization.

73961666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36980835.

The product of its digits is 244944, while the sum is 44.

The square root of 73961666 is about 8600.0968599197. The cubic root of 73961666 is about 419.7611378007.

The spelling of 73961666 in words is "seventy-three million, nine hundred sixty-one thousand, six hundred sixty-six".