3666525421 has 8 divisors (see below), whose sum is σ = 3964300704. Its totient is φ = 3370998000.

The previous prime is 3666525391. The next prime is 3666525431. The reversal of 3666525421 is 1245256663.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 3666525421 - 2¹¹ = 3666523373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3666525431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 558571 + ... + 565096.

It is an arithmetic number, because the mean of its divisors is an integer number (495537588).

Almost surely, 2^3666525421 is an apocalyptic number.

It is an amenable number.

3666525421 is a deficient number, since it is larger than the sum of its proper divisors (297775283).

3666525421 is a wasteful number, since it uses less digits than its factorization.

3666525421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1123931.

The product of its digits is 259200, while the sum is 40.

The square root of 3666525421 is about 60551.8407730104. The cubic root of 3666525421 is about 1542.0018691207.

The spelling of 3666525421 in words is "three billion, six hundred sixty-six million, five hundred twenty-five thousand, four hundred twenty-one".