16681918346078 has 8 divisors (see below), whose sum is σ = 25213891851720. Its totient is φ = 8277287728840.

The previous prime is 16681918346021. The next prime is 16681918346081. The reversal of 16681918346078 is 87064381918661.

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

It is a junction number, because it is equal to n+sod(n) for n = 16681918345999 and 16681918346017.

It is a congruent number.

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, 31835721773 + ... + 31835722296.

It is an arithmetic number, because the mean of its divisors is an integer number (3151736481465).

Almost surely, 2^{16681918346078} is an apocalyptic number.

16681918346078 is a deficient number, since it is larger than the sum of its proper divisors (8531973505642).

16681918346078 is a wasteful number, since it uses less digits than its factorization.

16681918346078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63671444202.

The product of its (nonzero) digits is 83607552, while the sum is 68.

The spelling of 16681918346078 in words is "sixteen trillion, six hundred eighty-one billion, nine hundred eighteen million, three hundred forty-six thousand, seventy-eight".