18278837782 has 4 divisors (see below), whose sum is σ = 27418256676. Its totient is φ = 9139418890.

The previous prime is 18278837723. The next prime is 18278837809. The reversal of 18278837782 is 28773887281.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 18278837782.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4569709444 + ... + 4569709447.

It is an arithmetic number, because the mean of its divisors is an integer number (6854564169).

Almost surely, 2^18278837782 is an apocalyptic number.

18278837782 is a deficient number, since it is larger than the sum of its proper divisors (9139418894).

18278837782 is an equidigital number, since it uses as much as digits as its factorization.

18278837782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9139418893.

The product of its digits is 16859136, while the sum is 61.

The spelling of 18278837782 in words is "eighteen billion, two hundred seventy-eight million, eight hundred thirty-seven thousand, seven hundred eighty-two".