16581878840 has 32 divisors (see below), whose sum is σ = 37355418000. Its totient is φ = 6624539904.

The previous prime is 16581878837. The next prime is 16581878849. The reversal of 16581878840 is 4887818561.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16581878849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 223850 + ... + 288569.

Almost surely, 2^16581878840 is an apocalyptic number.

16581878840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16581878840 is an abundant number, since it is smaller than the sum of its proper divisors (20773539160).

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

16581878840 is a wasteful number, since it uses less digits than its factorization.

16581878840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513239 (or 513235 counting only the distinct ones).

The product of its (nonzero) digits is 3440640, while the sum is 56.

The spelling of 16581878840 in words is "sixteen billion, five hundred eighty-one million, eight hundred seventy-eight thousand, eight hundred forty".