16581344378 has 8 divisors (see below), whose sum is σ = 25113492768. Its totient is φ = 8210180124.

The previous prime is 16581344369. The next prime is 16581344467. The reversal of 16581344378 is 87344318561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 40245776 + ... + 40246187.

It is an arithmetic number, because the mean of its divisors is an integer number (3139186596).

Almost surely, 2^16581344378 is an apocalyptic number.

16581344378 is a deficient number, since it is larger than the sum of its proper divisors (8532148390).

16581344378 is a wasteful number, since it uses less digits than its factorization.

16581344378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80492068.

The product of its digits is 1935360, while the sum is 50.

The spelling of 16581344378 in words is "sixteen billion, five hundred eighty-one million, three hundred forty-four thousand, three hundred seventy-eight".