2221580664 has 24 divisors (see below), whose sum is σ = 6016781160. Its totient is φ = 740526864.

The previous prime is 2221580663. The next prime is 2221580671. The reversal of 2221580664 is 4660851222.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221580663) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 15427572 + ... + 15427715.

It is an arithmetic number, because the mean of its divisors is an integer number (250699215).

Almost surely, 2^2221580664 is an apocalyptic number.

2221580664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

2221580664 is an abundant number, since it is smaller than the sum of its proper divisors (3795200496).

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

2221580664 is a wasteful number, since it uses less digits than its factorization.

2221580664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30855299 (or 30855292 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The square root of 2221580664 is about 47133.6468353553. The cubic root of 2221580664 is about 1304.8302875264.

The spelling of 2221580664 in words is "two billion, two hundred twenty-one million, five hundred eighty thousand, six hundred sixty-four".