16661885880 has 64 divisors (see below), whose sum is σ = 51336635040. Its totient is φ = 4323082752.

The previous prime is 16661885873. The next prime is 16661885887. The reversal of 16661885880 is 8858816661.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (16661885873) and next prime (16661885887).

It is a hoax number, since the sum of its digits (57) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 16661885880.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16661885887) 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, 1871899 + ... + 1880778.

Almost surely, 2^16661885880 is an apocalyptic number.

16661885880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16661885880 is an abundant number, since it is smaller than the sum of its proper divisors (34674749160).

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

16661885880 is a wasteful number, since it uses less digits than its factorization.

16661885880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3752728 (or 3752724 counting only the distinct ones).

The product of its (nonzero) digits is 4423680, while the sum is 57.

The spelling of 16661885880 in words is "sixteen billion, six hundred sixty-one million, eight hundred eighty-five thousand, eight hundred eighty".