3655041643561 has 32 divisors (see below), whose sum is σ = 4823571686400. Its totient is φ = 2683111366080.

The previous prime is 3655041643543. The next prime is 3655041643573. The reversal of 3655041643561 is 1653461405563.

It is a cyclic number.

It is not a de Polignac number, because 3655041643561 - 2⁵ = 3655041643529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3655041643661) 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 31 ways as a sum of consecutive naturals, for example, 6716670 + ... + 7240423.

It is an arithmetic number, because the mean of its divisors is an integer number (150736615200).

Almost surely, 2^{3655041643561} is an apocalyptic number.

It is an amenable number.

3655041643561 is a deficient number, since it is larger than the sum of its proper divisors (1168530042839).

3655041643561 is a wasteful number, since it uses less digits than its factorization.

3655041643561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13957309.

The product of its (nonzero) digits is 3888000, while the sum is 49.

The spelling of 3655041643561 in words is "three trillion, six hundred fifty-five billion, forty-one million, six hundred forty-three thousand, five hundred sixty-one".