17982776478 has 16 divisors (see below), whose sum is σ = 36420814080. Its totient is φ = 5918381976.

The previous prime is 17982776447. The next prime is 17982776479. The reversal of 17982776478 is 87467728971.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17982776479) 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, 18968700 + ... + 18969647.

It is an arithmetic number, because the mean of its divisors is an integer number (2276300880).

Almost surely, 2^17982776478 is an apocalyptic number.

17982776478 is an abundant number, since it is smaller than the sum of its proper divisors (18438037602).

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

17982776478 is a wasteful number, since it uses less digits than its factorization.

17982776478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37938431.

The product of its digits is 66382848, while the sum is 66.

The spelling of 17982776478 in words is "seventeen billion, nine hundred eighty-two million, seven hundred seventy-six thousand, four hundred seventy-eight".