3456649681 has 2 divisors, whose sum is σ = 3456649682. Its totient is φ = 3456649680.

The previous prime is 3456649673. The next prime is 3456649741. The reversal of 3456649681 is 1869466543.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2450745025 + 1005904656 = 49505^2 + 31716^2 .

It is a cyclic number.

It is not a de Polignac number, because 3456649681 - 2³ = 3456649673 is a prime.

It is a super-2 number, since 2×3456649681² = 23896854034314803522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3456649601) 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 as a sum of consecutive naturals, namely, 1728324840 + 1728324841.

It is an arithmetic number, because the mean of its divisors is an integer number (1728324841).

Almost surely, 2^3456649681 is an apocalyptic number.

It is an amenable number.

3456649681 is a deficient number, since it is larger than the sum of its proper divisors (1).

3456649681 is an equidigital number, since it uses as much as digits as its factorization.

3456649681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3732480, while the sum is 52.

The square root of 3456649681 is about 58793.2792162506. The cubic root of 3456649681 is about 1511.9999931471. Note that the first 5 decimals are identical.

The spelling of 3456649681 in words is "three billion, four hundred fifty-six million, six hundred forty-nine thousand, six hundred eighty-one".