16870778818 has 8 divisors (see below), whose sum is σ = 26794766412. Its totient is φ = 7939190016.

The previous prime is 16870778809. The next prime is 16870778843. The reversal of 16870778818 is 81887707861.

It can be written as a sum of positive squares in 2 ways, for example, as 16610827689 + 259951129 = 128883^2 + 16123^2 .

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, 248099655 + ... + 248099722.

Almost surely, 2^16870778818 is an apocalyptic number.

16870778818 is a deficient number, since it is larger than the sum of its proper divisors (9923987594).

16870778818 is a wasteful number, since it uses less digits than its factorization.

16870778818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 496199396.

The product of its (nonzero) digits is 8429568, while the sum is 61.

The spelling of 16870778818 in words is "sixteen billion, eight hundred seventy million, seven hundred seventy-eight thousand, eight hundred eighteen".