16661005570 has 48 divisors (see below), whose sum is σ = 34528768128. Its totient is φ = 5739662880.

The previous prime is 16661005561. The next prime is 16661005573. The reversal of 16661005570 is 7550016661.

16661005570 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (16661005573) 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 23 ways as a sum of consecutive naturals, for example, 170074 + ... + 249493.

It is an arithmetic number, because the mean of its divisors is an integer number (719349336).

Almost surely, 2^16661005570 is an apocalyptic number.

16661005570 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16661005570 is an abundant number, since it is smaller than the sum of its proper divisors (17867762558).

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

16661005570 is a wasteful number, since it uses less digits than its factorization.

16661005570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419623 (or 419604 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 37.

The spelling of 16661005570 in words is "sixteen billion, six hundred sixty-one million, five thousand, five hundred seventy".