6646727457 has 16 divisors (see below), whose sum is σ = 9867242880. Its totient is φ = 4422044016.

The previous prime is 6646727449. The next prime is 6646727531. The reversal of 6646727457 is 7547276466.

6646727457 is a `hidden beast` number, since 66 + 467 + 2 + 74 + 57 = 666.

It is not a de Polignac number, because 6646727457 - 2³ = 6646727449 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (6646727557) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 239598 + ... + 265895.

It is an arithmetic number, because the mean of its divisors is an integer number (616702680).

Almost surely, 2^6646727457 is an apocalyptic number.

It is an amenable number.

6646727457 is a deficient number, since it is larger than the sum of its proper divisors (3220515423).

6646727457 is a wasteful number, since it uses less digits than its factorization.

6646727457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505989 (or 505983 counting only the distinct ones).

The product of its digits is 11854080, while the sum is 54.

The square root of 6646727457 is about 81527.4644337723. The cubic root of 6646727457 is about 1880.1938325309.

The spelling of 6646727457 in words is "six billion, six hundred forty-six million, seven hundred twenty-seven thousand, four hundred fifty-seven".