74005661 has 4 divisors (see below), whose sum is σ = 76005852. Its totient is φ = 72005472.

The previous prime is 74005639. The next prime is 74005663. The reversal of 74005661 is 16650047.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 69139225 + 4866436 = 8315^2 + 2206^2 .

It is a cyclic number.

It is not a de Polignac number, because 74005661 - 2¹⁴ = 73989277 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 (74005663) 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, 1000040 + ... + 1000113.

It is an arithmetic number, because the mean of its divisors is an integer number (19001463).

Almost surely, 2^74005661 is an apocalyptic number.

It is an amenable number.

74005661 is a deficient number, since it is larger than the sum of its proper divisors (2000191).

74005661 is a wasteful number, since it uses less digits than its factorization.

74005661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2000190.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 74005661 is about 8602.6542996915. The cubic root of 74005661 is about 419.8443508658.

The spelling of 74005661 in words is "seventy-four million, five thousand, six hundred sixty-one".