3646955561 has 4 divisors (see below), whose sum is σ = 3649545300. Its totient is φ = 3644365824.

The previous prime is 3646955539. The next prime is 3646955563. The reversal of 3646955561 is 1655596463.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1655596463 = 59 ⋅28060957.

It can be written as a sum of positive squares in 2 ways, for example, as 322741225 + 3324214336 = 17965^2 + 57656^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3646955561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3646955563) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1292756 + ... + 1295573.

It is an arithmetic number, because the mean of its divisors is an integer number (912386325).

Almost surely, 2^3646955561 is an apocalyptic number.

It is an amenable number.

3646955561 is a deficient number, since it is larger than the sum of its proper divisors (2589739).

3646955561 is a wasteful number, since it uses less digits than its factorization.

3646955561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2589738.

The product of its digits is 2916000, while the sum is 50.

The square root of 3646955561 is about 60390.0286553997. The cubic root of 3646955561 is about 1539.2535260364.

The spelling of 3646955561 in words is "three billion, six hundred forty-six million, nine hundred fifty-five thousand, five hundred sixty-one".