16662001020 has 144 divisors (see below), whose sum is σ = 54480007680. Its totient is φ = 3727218816.

The previous prime is 16662001009. The next prime is 16662001043. The reversal of 16662001020 is 2010026661.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 918801 + ... + 936759.

Almost surely, 2^16662001020 is an apocalyptic number.

16662001020 is a gapful number since it is divisible by the number (10) 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 16662001020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27240003840).

16662001020 is an abundant number, since it is smaller than the sum of its proper divisors (37818006660).

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

16662001020 is a wasteful number, since it uses less digits than its factorization.

16662001020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18072 (or 18023 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

Adding to 16662001020 its reverse (2010026661), we get a palindrome (18672027681).

The spelling of 16662001020 in words is "sixteen billion, six hundred sixty-two million, one thousand, twenty".