12169661980 has 24 divisors (see below), whose sum is σ = 29207189088. Its totient is φ = 4172455488.

The previous prime is 12169661957. The next prime is 12169662023. The reversal of 12169661980 is 8916696121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43462939 + ... + 43463218.

It is an arithmetic number, because the mean of its divisors is an integer number (1216966212).

Almost surely, 2^12169661980 is an apocalyptic number.

12169661980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12169661980 is an abundant number, since it is smaller than the sum of its proper divisors (17037527108).

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

12169661980 is a wasteful number, since it uses less digits than its factorization.

12169661980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86926173 (or 86926171 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 49.

The spelling of 12169661980 in words is "twelve billion, one hundred sixty-nine million, six hundred sixty-one thousand, nine hundred eighty".