6721161650 has 96 divisors (see below), whose sum is σ = 15924159360. Its totient is φ = 2054661120.

The previous prime is 6721161647. The next prime is 6721161653. The reversal of 6721161650 is 561611276.

It is an interprime number because it is at equal distance from previous prime (6721161647) and next prime (6721161653).

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 6721161650.

It is not an unprimeable number, because it can be changed into a prime (6721161653) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 83324 + ... + 142776.

It is an arithmetic number, because the mean of its divisors is an integer number (165876660).

Almost surely, 2^6721161650 is an apocalyptic number.

6721161650 is an abundant number, since it is smaller than the sum of its proper divisors (9202997710).

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

6721161650 is a wasteful number, since it uses less digits than its factorization.

6721161650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59508 (or 59503 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 6721161650 is about 81982.6911610006. The cubic root of 6721161650 is about 1887.1863221556.

The spelling of 6721161650 in words is "six billion, seven hundred twenty-one million, one hundred sixty-one thousand, six hundred fifty".