3666542225 has 12 divisors (see below), whose sum is σ = 4547263644. Its totient is φ = 2932749120.

The previous prime is 3666542213. The next prime is 3666542261. The reversal of 3666542225 is 5222456663.

It can be written as a sum of positive squares in 6 ways, for example, as 198274561 + 3468267664 = 14081^2 + 58892^2 .

It is not a de Polignac number, because 3666542225 - 2²⁸ = 3398106769 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 286667 + ... + 299183.

It is an arithmetic number, because the mean of its divisors is an integer number (378938637).

Almost surely, 2^3666542225 is an apocalyptic number.

It is an amenable number.

3666542225 is a deficient number, since it is larger than the sum of its proper divisors (880721419).

3666542225 is a wasteful number, since it uses less digits than its factorization.

3666542225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24244 (or 24239 counting only the distinct ones).

The product of its digits is 518400, while the sum is 41.

The square root of 3666542225 is about 60551.9795299873. The cubic root of 3666542225 is about 1542.0042248260.

Adding to 3666542225 its reverse (5222456663), we get a palindrome (8888998888).

The spelling of 3666542225 in words is "three billion, six hundred sixty-six million, five hundred forty-two thousand, two hundred twenty-five".