6649410681 has 12 divisors (see below), whose sum is σ = 9809060352. Its totient is φ = 4338622296.

The previous prime is 6649410679. The next prime is 6649410683. The reversal of 6649410681 is 1860149466.

It is an interprime number because it is at equal distance from previous prime (6649410679) and next prime (6649410683).

It is not a de Polignac number, because 6649410681 - 2¹ = 6649410679 is a prime.

It is a super-2 number, since 2×6649410681² = 88429324809193767522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6649410683) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7859401 + ... + 7860246.

It is an arithmetic number, because the mean of its divisors is an integer number (817421696).

Almost surely, 2^6649410681 is an apocalyptic number.

It is an amenable number.

6649410681 is a deficient number, since it is larger than the sum of its proper divisors (3159649671).

6649410681 is a wasteful number, since it uses less digits than its factorization.

6649410681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15719700 (or 15719697 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 6649410681 is about 81543.9187248197. The cubic root of 6649410681 is about 1880.4468042643.

The spelling of 6649410681 in words is "six billion, six hundred forty-nine million, four hundred ten thousand, six hundred eighty-one".