16681696154 has 4 divisors (see below), whose sum is σ = 25022544234. Its totient is φ = 8340848076.

The previous prime is 16681696121. The next prime is 16681696177. The reversal of 16681696154 is 45169618661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 45169618661 = 103 ⋅438539987.

It can be written as a sum of positive squares in only one way, i.e., 16541818225 + 139877929 = 128615^2 + 11827^2 .

It is a junction number, because it is equal to n+sod(n) for n = 16681696096 and 16681696105.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4170424037 + ... + 4170424040.

Almost surely, 2^16681696154 is an apocalyptic number.

16681696154 is a deficient number, since it is larger than the sum of its proper divisors (8340848080).

16681696154 is an equidigital number, since it uses as much as digits as its factorization.

16681696154 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8340848079.

The product of its digits is 1866240, while the sum is 53.

The spelling of 16681696154 in words is "sixteen billion, six hundred eighty-one million, six hundred ninety-six thousand, one hundred fifty-four".