6853749649 has 8 divisors (see below), whose sum is σ = 7051644648. Its totient is φ = 6656520960.

The previous prime is 6853749629. The next prime is 6853749653. The reversal of 6853749649 is 9469473586.

It can be written as a sum of positive squares in 4 ways, for example, as 2805609024 + 4048140625 = 52968^2 + 63625^2 .

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 6853749649 - 2⁹ = 6853749137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6853749629) 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, 145672 + ... + 186889.

It is an arithmetic number, because the mean of its divisors is an integer number (881455581).

Almost surely, 2^6853749649 is an apocalyptic number.

It is an amenable number.

6853749649 is a deficient number, since it is larger than the sum of its proper divisors (197894999).

6853749649 is a wasteful number, since it uses less digits than its factorization.

6853749649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333155.

The product of its digits is 39191040, while the sum is 61.

The square root of 6853749649 is about 82787.3761451587. The cubic root of 6853749649 is about 1899.5150792955.

The spelling of 6853749649 in words is "six billion, eight hundred fifty-three million, seven hundred forty-nine thousand, six hundred forty-nine".