3665721650 has 24 divisors (see below), whose sum is σ = 6871941120. Its totient is φ = 1454740560.

The previous prime is 3665721649. The next prime is 3665721659. The reversal of 3665721650 is 561275663.

It is a junction number, because it is equal to n+sod(n) for n = 3665721598 and 3665721607.

It is not an unprimeable number, because it can be changed into a prime (3665721659) 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 11 ways as a sum of consecutive naturals, for example, 282290 + ... + 294989.

It is an arithmetic number, because the mean of its divisors is an integer number (286330880).

Almost surely, 2^3665721650 is an apocalyptic number.

3665721650 is a deficient number, since it is larger than the sum of its proper divisors (3206219470).

3665721650 is a wasteful number, since it uses less digits than its factorization.

3665721650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 577418 (or 577413 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 41.

The square root of 3665721650 is about 60545.2033607948. The cubic root of 3665721650 is about 1541.8891823287.

The spelling of 3665721650 in words is "three billion, six hundred sixty-five million, seven hundred twenty-one thousand, six hundred fifty".