6655655213 has 4 divisors (see below), whose sum is σ = 6716716380. Its totient is φ = 6594594048.

The previous prime is 6655655191. The next prime is 6655655221. The reversal of 6655655213 is 3125565566.

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 2436113449 + 4219541764 = 49357^2 + 64958^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6655655213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6655655263) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30530420 + ... + 30530637.

It is an arithmetic number, because the mean of its divisors is an integer number (1679179095).

Almost surely, 2^6655655213 is an apocalyptic number.

It is an amenable number.

6655655213 is a deficient number, since it is larger than the sum of its proper divisors (61061167).

6655655213 is a wasteful number, since it uses less digits than its factorization.

6655655213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61061166.

The product of its digits is 810000, while the sum is 44.

The square root of 6655655213 is about 81582.1991184351. The cubic root of 6655655213 is about 1881.0352692619.

The spelling of 6655655213 in words is "six billion, six hundred fifty-five million, six hundred fifty-five thousand, two hundred thirteen".