6667646457 has 32 divisors (see below), whose sum is σ = 9219772800. Its totient is φ = 4282882560.

The previous prime is 6667646429. The next prime is 6667646467. The reversal of 6667646457 is 7546467666.

6667646457 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 6667646457 - 2³⁰ = 5593904633 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6667646397 and 6667646406.

It is not an unprimeable number, because it can be changed into a prime (6667646407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6355669 + ... + 6356717.

It is an arithmetic number, because the mean of its divisors is an integer number (288117900).

Almost surely, 2^6667646457 is an apocalyptic number.

It is an amenable number.

6667646457 is a deficient number, since it is larger than the sum of its proper divisors (2552126343).

6667646457 is a wasteful number, since it uses less digits than its factorization.

6667646457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1593.

The product of its digits is 30481920, while the sum is 57.

The square root of 6667646457 is about 81655.6578382662. The cubic root of 6667646457 is about 1882.1642550459.

The spelling of 6667646457 in words is "six billion, six hundred sixty-seven million, six hundred forty-six thousand, four hundred fifty-seven".