16540111980 has 96 divisors (see below), whose sum is σ = 58809300480. Its totient is φ = 3780596160.

The previous prime is 16540111963. The next prime is 16540111999. The reversal of 16540111980 is 8911104561.

It is a happy number.

16540111980 is a `hidden beast` number, since 1 + 65 + 401 + 1 + 198 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

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 31 ways as a sum of consecutive naturals, for example, 2184066 + ... + 2191625.

It is an arithmetic number, because the mean of its divisors is an integer number (612596880).

Almost surely, 2^16540111980 is an apocalyptic number.

16540111980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16540111980 is an abundant number, since it is smaller than the sum of its proper divisors (42269188500).

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

16540111980 is a wasteful number, since it uses less digits than its factorization.

16540111980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4375716 (or 4375708 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 36.

The spelling of 16540111980 in words is "sixteen billion, five hundred forty million, one hundred eleven thousand, nine hundred eighty".