6851665650 has 24 divisors (see below), whose sum is σ = 16992131184. Its totient is φ = 1827110800.

The previous prime is 6851665649. The next prime is 6851665651. The reversal of 6851665650 is 565661586.

It is an interprime number because it is at equal distance from previous prime (6851665649) and next prime (6851665651).

It is a self number, because there is not a number n which added to its sum of digits gives 6851665650.

It is not an unprimeable number, because it can be changed into a prime (6851665651) 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, 22838736 + ... + 22839035.

It is an arithmetic number, because the mean of its divisors is an integer number (708005466).

Almost surely, 2^6851665650 is an apocalyptic number.

6851665650 is an abundant number, since it is smaller than the sum of its proper divisors (10140465534).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6851665650 is a wasteful number, since it uses less digits than its factorization.

6851665650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45677786 (or 45677781 counting only the distinct ones).

The product of its (nonzero) digits is 1296000, while the sum is 48.

The square root of 6851665650 is about 82774.7887342517. The cubic root of 6851665650 is about 1899.3225331700.

The spelling of 6851665650 in words is "six billion, eight hundred fifty-one million, six hundred sixty-five thousand, six hundred fifty".