3721606065 has 24 divisors (see below), whose sum is σ = 6539156520. Its totient is φ = 1957665024.

The previous prime is 3721606061. The next prime is 3721606073. The reversal of 3721606065 is 5606061273.

3721606065 is a `hidden beast` number, since 37 + 2 + 16 + 0 + 606 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 525739041 + 3195867024 = 22929^2 + 56532^2 .

It is not a de Polignac number, because 3721606065 - 2² = 3721606061 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3721606061) 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 23 ways as a sum of consecutive naturals, for example, 563170 + ... + 569739.

It is an arithmetic number, because the mean of its divisors is an integer number (272464855).

Almost surely, 2^3721606065 is an apocalyptic number.

It is an amenable number.

3721606065 is a deficient number, since it is larger than the sum of its proper divisors (2817550455).

3721606065 is a wasteful number, since it uses less digits than its factorization.

3721606065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1132993 (or 1132990 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The square root of 3721606065 is about 61004.9675436353. The cubic root of 3721606065 is about 1549.6851341003.

It can be divided in two parts, 372160 and 6065, that added together give a square (378225 = 615²).

The spelling of 3721606065 in words is "three billion, seven hundred twenty-one million, six hundred six thousand, sixty-five".