6656544387 has 8 divisors (see below), whose sum is σ = 9861547280. Its totient is φ = 4437696240.

The previous prime is 6656544359. The next prime is 6656544413. The reversal of 6656544387 is 7834456566.

6656544387 is a `hidden beast` number, since 6 + 6 + 565 + 44 + 38 + 7 = 666.

It is not a de Polignac number, because 6656544387 - 2¹⁰ = 6656543363 is a prime.

It is a super-2 number, since 2×6656544387² = 88619166352202411538, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6656544317) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123269314 + ... + 123269367.

It is an arithmetic number, because the mean of its divisors is an integer number (1232693410).

Almost surely, 2^6656544387 is an apocalyptic number.

6656544387 is a deficient number, since it is larger than the sum of its proper divisors (3205002893).

6656544387 is a wasteful number, since it uses less digits than its factorization.

6656544387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246538690 (or 246538684 counting only the distinct ones).

The product of its digits is 14515200, while the sum is 54.

The square root of 6656544387 is about 81587.6484953452. The cubic root of 6656544387 is about 1881.1190322736.

The spelling of 6656544387 in words is "six billion, six hundred fifty-six million, five hundred forty-four thousand, three hundred eighty-seven".