2066621664 has 96 divisors (see below), whose sum is σ = 5667217920. Its totient is φ = 658570752.

The previous prime is 2066621663. The next prime is 2066621671. The reversal of 2066621664 is 4661266602.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×2066621664² = 8541850204228257792, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2066621663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 283149 + ... + 290355.

It is an arithmetic number, because the mean of its divisors is an integer number (59033520).

Almost surely, 2^2066621664 is an apocalyptic number.

2066621664 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2066621664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2833608960).

2066621664 is an abundant number, since it is smaller than the sum of its proper divisors (3600596256).

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

2066621664 is a wasteful number, since it uses less digits than its factorization.

2066621664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7352 (or 7344 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 39.

The square root of 2066621664 is about 45460.1106905824. The cubic root of 2066621664 is about 1273.7581991541.

The spelling of 2066621664 in words is "two billion, sixty-six million, six hundred twenty-one thousand, six hundred sixty-four".