16031954778 has 32 divisors (see below), whose sum is σ = 36968766336. Its totient is φ = 4540021248.

The previous prime is 16031954777. The next prime is 16031954801. The reversal of 16031954778 is 87745913061.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 16031954778.

It is not an unprimeable number, because it can be changed into a prime (16031954777) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1684251 + ... + 1693742.

It is an arithmetic number, because the mean of its divisors is an integer number (1155273948).

Almost surely, 2^16031954778 is an apocalyptic number.

16031954778 is an abundant number, since it is smaller than the sum of its proper divisors (20936811558).

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

16031954778 is a wasteful number, since it uses less digits than its factorization.

16031954778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3378118.

The product of its (nonzero) digits is 1270080, while the sum is 51.

The spelling of 16031954778 in words is "sixteen billion, thirty-one million, nine hundred fifty-four thousand, seven hundred seventy-eight".