3645665657 has 4 divisors (see below), whose sum is σ = 3860116596. Its totient is φ = 3431214720.

The previous prime is 3645665629. The next prime is 3645665677. The reversal of 3645665657 is 7565665463.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7565665463 = 127 ⋅59572169.

It can be written as a sum of positive squares in 2 ways, for example, as 2888095081 + 757570576 = 53741^2 + 27524^2 .

It is not a de Polignac number, because 3645665657 - 2¹⁸ = 3645403513 is a prime.

It is a super-3 number, since 3×3645665657³ (a number of 30 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3645665599 and 3645665608.

It is not an unprimeable number, because it can be changed into a prime (3645665677) 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 3 ways as a sum of consecutive naturals, for example, 107225444 + ... + 107225477.

It is an arithmetic number, because the mean of its divisors is an integer number (965029149).

Almost surely, 2^3645665657 is an apocalyptic number.

It is an amenable number.

3645665657 is a deficient number, since it is larger than the sum of its proper divisors (214450939).

3645665657 is a wasteful number, since it uses less digits than its factorization.

3645665657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214450938.

The product of its digits is 13608000, while the sum is 53.

The square root of 3645665657 is about 60379.3479345380. The cubic root of 3645665657 is about 1539.0720300482.

The spelling of 3645665657 in words is "three billion, six hundred forty-five million, six hundred sixty-five thousand, six hundred fifty-seven".