73618661 has 4 divisors (see below), whose sum is σ = 73837452. Its totient is φ = 73399872.

The previous prime is 73618651. The next prime is 73618663. The reversal of 73618661 is 16681637.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16681637 = 7 ⋅2383091.

It can be written as a sum of positive squares in 2 ways, for example, as 41344900 + 32273761 = 6430^2 + 5681^2 .

It is a cyclic number.

It is not a de Polignac number, because 73618661 - 2¹⁰ = 73617637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73618663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108890 + ... + 109563.

It is an arithmetic number, because the mean of its divisors is an integer number (18459363).

Almost surely, 2^73618661 is an apocalyptic number.

It is an amenable number.

73618661 is a deficient number, since it is larger than the sum of its proper divisors (218791).

73618661 is a wasteful number, since it uses less digits than its factorization.

73618661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 218790.

The product of its digits is 36288, while the sum is 38.

The square root of 73618661 is about 8580.1317588951. The cubic root of 73618661 is about 419.1112366357. Note that the first 3 decimals are identical.

The spelling of 73618661 in words is "seventy-three million, six hundred eighteen thousand, six hundred sixty-one".