16779878216 has 8 divisors (see below), whose sum is σ = 31462271670. Its totient is φ = 8389939104.

The previous prime is 16779878201. The next prime is 16779878263. The reversal of 16779878216 is 61287897761.

It can be written as a sum of positive squares in only one way, i.e., 15839229316 + 940648900 = 125854^2 + 30670^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1048742381 + ... + 1048742396.

Almost surely, 2^16779878216 is an apocalyptic number.

It is an amenable number.

16779878216 is a deficient number, since it is larger than the sum of its proper divisors (14682393454).

16779878216 is a wasteful number, since it uses less digits than its factorization.

16779878216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2097484783 (or 2097484779 counting only the distinct ones).

The product of its digits is 14224896, while the sum is 62.

The spelling of 16779878216 in words is "sixteen billion, seven hundred seventy-nine million, eight hundred seventy-eight thousand, two hundred sixteen".