3665120645 has 8 divisors (see below), whose sum is σ = 4470245880. Its totient is φ = 2884029120.

The previous prime is 3665120639. The next prime is 3665120663. The reversal of 3665120645 is 5460215663.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1723969 + 3663396676 = 1313^2 + 60526^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3665120645 - 2⁴ = 3665120629 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 3665120599 and 3665120608.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 6008090 + ... + 6008699.

It is an arithmetic number, because the mean of its divisors is an integer number (558780735).

Almost surely, 2^3665120645 is an apocalyptic number.

It is an amenable number.

3665120645 is a deficient number, since it is larger than the sum of its proper divisors (805125235).

3665120645 is a wasteful number, since it uses less digits than its factorization.

3665120645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12016855.

The product of its (nonzero) digits is 129600, while the sum is 38.

The square root of 3665120645 is about 60540.2398822469. The cubic root of 3665120645 is about 1541.8049120862.

The spelling of 3665120645 in words is "three billion, six hundred sixty-five million, one hundred twenty thousand, six hundred forty-five".