6651881 has 8 divisors (see below), whose sum is σ = 7173600. Its totient is φ = 6147360.

The previous prime is 6651857. The next prime is 6651907. The reversal of 6651881 is 1881566.

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 6651881 - 2¹⁸ = 6389737 is a prime.

It is a super-2 number, since 2×6651881² = 88495041676322, which contains 22 as substring.

It is a Duffinian number.

6651881 is a modest number, since divided by 1881 gives 665 as remainder.

It is not an unprimeable number, because it can be changed into a prime (6651851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3491 + ... + 5048.

It is an arithmetic number, because the mean of its divisors is an integer number (896700).

Almost surely, 2^6651881 is an apocalyptic number.

It is an amenable number.

6651881 is a deficient number, since it is larger than the sum of its proper divisors (521719).

6651881 is a wasteful number, since it uses less digits than its factorization.

6651881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8599.

The product of its digits is 11520, while the sum is 35.

The square root of 6651881 is about 2579.1240761158. The cubic root of 6651881 is about 188.0679643361.

The spelling of 6651881 in words is "six million, six hundred fifty-one thousand, eight hundred eighty-one".