6656115651205 has 4 divisors (see below), whose sum is σ = 7987338781452. Its totient is φ = 5324892520960.

The previous prime is 6656115651187. The next prime is 6656115651221. The reversal of 6656115651205 is 5021565116566.

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 2066653507396 + 4589462143809 = 1437586^2 + 2142303^2 .

It is not a de Polignac number, because 6656115651205 - 2²⁷ = 6655981433477 is a prime.

It is a super-2 number, since 2×6656115651205² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent 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, 665611565116 + ... + 665611565125.

It is an arithmetic number, because the mean of its divisors is an integer number (1996834695363).

Almost surely, 2^{6656115651205} is an apocalyptic number.

It is an amenable number.

6656115651205 is a deficient number, since it is larger than the sum of its proper divisors (1331223130247).

6656115651205 is a wasteful number, since it uses less digits than its factorization.

6656115651205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1331223130246.

The product of its (nonzero) digits is 1620000, while the sum is 49.

The spelling of 6656115651205 in words is "six trillion, six hundred fifty-six billion, one hundred fifteen million, six hundred fifty-one thousand, two hundred five".