16978420893 has 8 divisors (see below), whose sum is σ = 25871879488. Its totient is φ = 9701954784.

The previous prime is 16978420891. The next prime is 16978420903. The reversal of 16978420893 is 39802487961.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16978420893 - 2¹ = 16978420891 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16978420891) 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, 404248096 + ... + 404248137.

It is an arithmetic number, because the mean of its divisors is an integer number (3233984936).

Almost surely, 2^16978420893 is an apocalyptic number.

It is an amenable number.

16978420893 is a deficient number, since it is larger than the sum of its proper divisors (8893458595).

16978420893 is an equidigital number, since it uses as much as digits as its factorization.

16978420893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 808496243.

The product of its (nonzero) digits is 5225472, while the sum is 57.

The spelling of 16978420893 in words is "sixteen billion, nine hundred seventy-eight million, four hundred twenty thousand, eight hundred ninety-three".