6657961 has 8 divisors (see below), whose sum is σ = 7061600. Its totient is φ = 6259680.

The previous prime is 6657953. The next prime is 6657979. The reversal of 6657961 is 1697566.

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

It is a cyclic number.

It is not a de Polignac number, because 6657961 - 2³ = 6657953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6657061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1381 + ... + 3901.

It is an arithmetic number, because the mean of its divisors is an integer number (882700).

Almost surely, 2^6657961 is an apocalyptic number.

It is an amenable number.

6657961 is a deficient number, since it is larger than the sum of its proper divisors (403639).

6657961 is a wasteful number, since it uses less digits than its factorization.

6657961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2679.

The product of its digits is 68040, while the sum is 40.

The square root of 6657961 is about 2580.3025016459. The cubic root of 6657961 is about 188.1252466305.

The spelling of 6657961 in words is "six million, six hundred fifty-seven thousand, nine hundred sixty-one".