6213564545665 has 4 divisors (see below), whose sum is σ = 7456277454804. Its totient is φ = 4970851636528.

The previous prime is 6213564545653. The next prime is 6213564545701. The reversal of 6213564545665 is 5665454653126.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3826440664641 + 2387123881024 = 1956129^2 + 1545032^2 .

It is a cyclic number.

It is not a de Polignac number, because 6213564545665 - 2³¹ = 6211417062017 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 621356454562 + ... + 621356454571.

It is an arithmetic number, because the mean of its divisors is an integer number (1864069363701).

Almost surely, 2^{6213564545665} is an apocalyptic number.

It is an amenable number.

6213564545665 is a deficient number, since it is larger than the sum of its proper divisors (1242712909139).

6213564545665 is a wasteful number, since it uses less digits than its factorization.

6213564545665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1242712909138.

The product of its digits is 77760000, while the sum is 58.

The spelling of 6213564545665 in words is "six trillion, two hundred thirteen billion, five hundred sixty-four million, five hundred forty-five thousand, six hundred sixty-five".