6650681 has 4 divisors (see below), whose sum is σ = 6805392. Its totient is φ = 6495972.

The previous prime is 6650671. The next prime is 6650687. The reversal of 6650681 is 1860566.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1860566 = 2 ⋅930283.

It is a cyclic number.

It is not a de Polignac number, because 6650681 - 2¹⁴ = 6634297 is a prime.

It is a super-2 number, since 2×6650681² = 88463115527522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6650687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77291 + ... + 77376.

It is an arithmetic number, because the mean of its divisors is an integer number (1701348).

Almost surely, 2^6650681 is an apocalyptic number.

It is an amenable number.

6650681 is a deficient number, since it is larger than the sum of its proper divisors (154711).

6650681 is a wasteful number, since it uses less digits than its factorization.

6650681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154710.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 6650681 is about 2578.8914285018. The cubic root of 6650681 is about 188.0566544961.

The spelling of 6650681 in words is "six million, six hundred fifty thousand, six hundred eighty-one".