18705198782 has 4 divisors (see below), whose sum is σ = 28057798176. Its totient is φ = 9352599390.

The previous prime is 18705198769. The next prime is 18705198877. The reversal of 18705198782 is 28789150781.

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

It is a super-2 number, since 2×18705198782² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4676299694 + ... + 4676299697.

It is an arithmetic number, because the mean of its divisors is an integer number (7014449544).

Almost surely, 2^18705198782 is an apocalyptic number.

18705198782 is a deficient number, since it is larger than the sum of its proper divisors (9352599394).

18705198782 is an equidigital number, since it uses as much as digits as its factorization.

18705198782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9352599393.

The product of its (nonzero) digits is 2257920, while the sum is 56.

The spelling of 18705198782 in words is "eighteen billion, seven hundred five million, one hundred ninety-eight thousand, seven hundred eighty-two".