6401845650 has 144 divisors (see below), whose sum is σ = 16622820000. Its totient is φ = 1630252800.

The previous prime is 6401845627. The next prime is 6401845651. The reversal of 6401845650 is 565481046.

It is a happy number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 6401845599 and 6401845608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6401845651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 12829101 + ... + 12829599.

It is an arithmetic number, because the mean of its divisors is an integer number (115436250).

Almost surely, 2^6401845650 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6401845650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8311410000).

6401845650 is an abundant number, since it is smaller than the sum of its proper divisors (10220974350).

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

6401845650 is a wasteful number, since it uses less digits than its factorization.

6401845650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 665 (or 629 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 39.

The square root of 6401845650 is about 80011.5344809734. The cubic root of 6401845650 is about 1856.8139902172.

The spelling of 6401845650 in words is "six billion, four hundred one million, eight hundred forty-five thousand, six hundred fifty".