17778378485 has 16 divisors (see below), whose sum is σ = 24385961856. Its totient is φ = 12188795328.

The previous prime is 17778378481. The next prime is 17778378533. The reversal of 17778378485 is 58487387771.

It is a cyclic number.

It is not a de Polignac number, because 17778378485 - 2² = 17778378481 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17778378481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 179234 + ... + 260156.

It is an arithmetic number, because the mean of its divisors is an integer number (1524122616).

Almost surely, 2^17778378485 is an apocalyptic number.

It is an amenable number.

17778378485 is a deficient number, since it is larger than the sum of its proper divisors (6607583371).

17778378485 is an equidigital number, since it uses as much as digits as its factorization.

17778378485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87212.

The product of its digits is 73758720, while the sum is 65.

The spelling of 17778378485 in words is "seventeen billion, seven hundred seventy-eight million, three hundred seventy-eight thousand, four hundred eighty-five".