16918891940 has 24 divisors (see below), whose sum is σ = 35532833280. Its totient is φ = 6766954848.

The previous prime is 16918891909. The next prime is 16918891949. The reversal of 16918891940 is 4919881961.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (16918891949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 244439 + ... + 305921.

It is an arithmetic number, because the mean of its divisors is an integer number (1480534720).

Almost surely, 2^16918891940 is an apocalyptic number.

16918891940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16918891940 is an abundant number, since it is smaller than the sum of its proper divisors (18613941340).

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

16918891940 is a wasteful number, since it uses less digits than its factorization.

16918891940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75251 (or 75249 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 56.

The spelling of 16918891940 in words is "sixteen billion, nine hundred eighteen million, eight hundred ninety-one thousand, nine hundred forty".