6656736247 has 4 divisors (see below), whose sum is σ = 7607698576. Its totient is φ = 5705773920.

The previous prime is 6656736239. The next prime is 6656736263. The reversal of 6656736247 is 7426376566.

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

It is not a de Polignac number, because 6656736247 - 2³ = 6656736239 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6656736194 and 6656736203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6656736227) 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, 475481154 + ... + 475481167.

It is an arithmetic number, because the mean of its divisors is an integer number (1901924644).

Almost surely, 2^6656736247 is an apocalyptic number.

6656736247 is a deficient number, since it is larger than the sum of its proper divisors (950962329).

6656736247 is an equidigital number, since it uses as much as digits as its factorization.

6656736247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 950962328.

The product of its digits is 7620480, while the sum is 52.

The square root of 6656736247 is about 81588.8242775933. The cubic root of 6656736247 is about 1881.1371051158.

The spelling of 6656736247 in words is "six billion, six hundred fifty-six million, seven hundred thirty-six thousand, two hundred forty-seven".