6467905649 has 2 divisors, whose sum is σ = 6467905650. Its totient is φ = 6467905648.

The previous prime is 6467905643. The next prime is 6467905667. The reversal of 6467905649 is 9465097646.

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., 5663616049 + 804289600 = 75257^2 + 28360^2 .

It is a cyclic number.

It is not a de Polignac number, because 6467905649 - 2³² = 2172938353 is a prime.

It is a super-3 number, since 3×6467905649³ (a number of 30 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 6467905594 and 6467905603.

It is not a weakly prime, because it can be changed into another prime (6467905643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3233952824 + 3233952825.

It is an arithmetic number, because the mean of its divisors is an integer number (3233952825).

Almost surely, 2^6467905649 is an apocalyptic number.

It is an amenable number.

6467905649 is a deficient number, since it is larger than the sum of its proper divisors (1).

6467905649 is an equidigital number, since it uses as much as digits as its factorization.

6467905649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9797760, while the sum is 56.

The square root of 6467905649 is about 80423.2904636462. The cubic root of 6467905649 is about 1863.1789058952.

The spelling of 6467905649 in words is "six billion, four hundred sixty-seven million, nine hundred five thousand, six hundred forty-nine".