6656444649 has 40 divisors (see below), whose sum is σ = 10052602560. Its totient is φ = 4389228000.

The previous prime is 6656444603. The next prime is 6656444659. The reversal of 6656444649 is 9464446566.

It is not a de Polignac number, because 6656444649 - 2¹⁶ = 6656379113 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6656444595 and 6656444604.

It is not an unprimeable number, because it can be changed into a prime (6656444659) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 3500599 + ... + 3502499.

It is an arithmetic number, because the mean of its divisors is an integer number (251315064).

Almost surely, 2^6656444649 is an apocalyptic number.

It is an amenable number.

6656444649 is a deficient number, since it is larger than the sum of its proper divisors (3396157911).

6656444649 is a wasteful number, since it uses less digits than its factorization.

6656444649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2363 (or 2354 counting only the distinct ones).

The product of its digits is 14929920, while the sum is 54.

The square root of 6656444649 is about 81587.0372608296. The cubic root of 6656444649 is about 1881.1096370090.

The spelling of 6656444649 in words is "six billion, six hundred fifty-six million, four hundred forty-four thousand, six hundred forty-nine".