18878582639 has 16 divisors (see below), whose sum is σ = 21937963008. Its totient is φ = 15912070272.

The previous prime is 18878582627. The next prime is 18878582651. The reversal of 18878582639 is 93628587881.

It is an interprime number because it is at equal distance from previous prime (18878582627) and next prime (18878582651).

It is not a de Polignac number, because 18878582639 - 2⁴ = 18878582623 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 (18878582699) 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, 6494 + ... + 194420.

It is an arithmetic number, because the mean of its divisors is an integer number (1371122688).

Almost surely, 2^18878582639 is an apocalyptic number.

18878582639 is a deficient number, since it is larger than the sum of its proper divisors (3059380369).

18878582639 is a wasteful number, since it uses less digits than its factorization.

18878582639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188174.

The product of its digits is 46448640, while the sum is 65.

The spelling of 18878582639 in words is "eighteen billion, eight hundred seventy-eight million, five hundred eighty-two thousand, six hundred thirty-nine".