16955384778 has 48 divisors (see below), whose sum is σ = 38129626080. Its totient is φ = 5646997296.

The previous prime is 16955384767. The next prime is 16955384819. The reversal of 16955384778 is 87748355961.

16955384778 is a `hidden beast` number, since 1 + 6 + 9 + 553 + 8 + 4 + 7 + 78 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 583101 + ... + 611487.

It is an arithmetic number, because the mean of its divisors is an integer number (794367210).

Almost surely, 2^16955384778 is an apocalyptic number.

16955384778 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

16955384778 is an abundant number, since it is smaller than the sum of its proper divisors (21174241302).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16955384778 is a wasteful number, since it uses less digits than its factorization.

16955384778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29633 (or 29621 counting only the distinct ones).

The product of its digits is 50803200, while the sum is 63.

The spelling of 16955384778 in words is "sixteen billion, nine hundred fifty-five million, three hundred eighty-four thousand, seven hundred seventy-eight".