6657681 has 8 divisors (see below), whose sum is σ = 8893504. Its totient is φ = 4430160.

The previous prime is 6657671. The next prime is 6657697. The reversal of 6657681 is 1867566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6657681 - 2¹¹ = 6655633 is a prime.

It is a super-2 number, since 2×6657681² = 88649432595522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6657631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135 + ... + 3651.

It is an arithmetic number, because the mean of its divisors is an integer number (1111688).

Almost surely, 2^6657681 is an apocalyptic number.

It is an amenable number.

6657681 is a deficient number, since it is larger than the sum of its proper divisors (2235823).

6657681 is a wasteful number, since it uses less digits than its factorization.

6657681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4151.

The product of its digits is 60480, while the sum is 39.

The square root of 6657681 is about 2580.2482438711. The cubic root of 6657681 is about 188.1226093963.

The spelling of 6657681 in words is "six million, six hundred fifty-seven thousand, six hundred eighty-one".