16640540280 has 192 divisors, whose sum is σ = 66562292160. Its totient is φ = 3510964224.

The previous prime is 16640540243. The next prime is 16640540281. The reversal of 16640540280 is 8204504661.

16640540280 is a `hidden beast` number, since 1 + 6 + 640 + 5 + 4 + 0 + 2 + 8 + 0 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16640540281) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 221217 + ... + 286736.

It is an arithmetic number, because the mean of its divisors is an integer number (346678605).

Almost surely, 2^16640540280 is an apocalyptic number.

16640540280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16640540280 is an abundant number, since it is smaller than the sum of its proper divisors (49921751880).

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

16640540280 is a wasteful number, since it uses less digits than its factorization.

16640540280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 507990 (or 507983 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The spelling of 16640540280 in words is "sixteen billion, six hundred forty million, five hundred forty thousand, two hundred eighty".