3666445825 has 36 divisors (see below), whose sum is σ = 5297670972. Its totient is φ = 2509852800.

The previous prime is 3666445817. The next prime is 3666445859. The reversal of 3666445825 is 5285446663.

It can be written as a sum of positive squares in 6 ways, for example, as 537497856 + 3128947969 = 23184^2 + 55937^2 .

It is not a de Polignac number, because 3666445825 - 2³ = 3666445817 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 827115 + ... + 831535.

It is an arithmetic number, because the mean of its divisors is an integer number (147157527).

Almost surely, 2^3666445825 is an apocalyptic number.

3666445825 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3666445825 is a deficient number, since it is larger than the sum of its proper divisors (1631225147).

3666445825 is a wasteful number, since it uses less digits than its factorization.

3666445825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5122 (or 5110 counting only the distinct ones).

The product of its digits is 4147200, while the sum is 49.

The square root of 3666445825 is about 60551.1835144450. The cubic root of 3666445825 is about 1541.9907106846.

The spelling of 3666445825 in words is "three billion, six hundred sixty-six million, four hundred forty-five thousand, eight hundred twenty-five".