6865949721 has 8 divisors (see below), whose sum is σ = 9235614240. Its totient is φ = 4536792512.

The previous prime is 6865949693. The next prime is 6865949729. The reversal of 6865949721 is 1279495686.

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 6865949721 - 2⁵ = 6865949689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6865949729) 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, 10126431 + ... + 10127108.

It is an arithmetic number, because the mean of its divisors is an integer number (1154451780).

Almost surely, 2^6865949721 is an apocalyptic number.

It is an amenable number.

6865949721 is a deficient number, since it is larger than the sum of its proper divisors (2369664519).

6865949721 is a wasteful number, since it uses less digits than its factorization.

6865949721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20253655.

The product of its digits is 6531840, while the sum is 57.

The square root of 6865949721 is about 82861.0265504839. The cubic root of 6865949721 is about 1900.6414935463.

The spelling of 6865949721 in words is "six billion, eight hundred sixty-five million, nine hundred forty-nine thousand, seven hundred twenty-one".