3660215861 has 16 divisors (see below), whose sum is σ = 3804169968. Its totient is φ = 3518784000.

The previous prime is 3660215833. The next prime is 3660215899. The reversal of 3660215861 is 1685120663.

It can be written as a sum of positive squares in 8 ways, for example, as 580520836 + 3079695025 = 24094^2 + 55495^2 .

It is a cyclic number.

It is not a de Polignac number, because 3660215861 - 2²⁶ = 3593106997 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 (3660215761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3067481 + ... + 3068673.

It is an arithmetic number, because the mean of its divisors is an integer number (237760623).

Almost surely, 2^3660215861 is an apocalyptic number.

It is an amenable number.

3660215861 is a deficient number, since it is larger than the sum of its proper divisors (143954107).

3660215861 is a wasteful number, since it uses less digits than its factorization.

3660215861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2152.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 3660215861 is about 60499.7178588463. The cubic root of 3660215861 is about 1541.1168405197.

The spelling of 3660215861 in words is "three billion, six hundred sixty million, two hundred fifteen thousand, eight hundred sixty-one".