6461911220 has 12 divisors (see below), whose sum is σ = 13570013604. Its totient is φ = 2584764480.

The previous prime is 6461911087. The next prime is 6461911271. The reversal of 6461911220 is 221191646.

It can be written as a sum of positive squares in 2 ways, for example, as 4495166116 + 1966745104 = 67046^2 + 44348^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 161547761 + ... + 161547800.

It is an arithmetic number, because the mean of its divisors is an integer number (1130834467).

Almost surely, 2^6461911220 is an apocalyptic number.

It is an amenable number.

6461911220 is an abundant number, since it is smaller than the sum of its proper divisors (7108102384).

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

6461911220 is a wasteful number, since it uses less digits than its factorization.

6461911220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323095570 (or 323095568 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 6461911220 is about 80386.0138332534. The cubic root of 6461911220 is about 1862.6031324060.

The spelling of 6461911220 in words is "six billion, four hundred sixty-one million, nine hundred eleven thousand, two hundred twenty".