18979939285 has 8 divisors (see below), whose sum is σ = 23561304120. Its totient is φ = 14660366784.

The previous prime is 18979939271. The next prime is 18979939301. The reversal of 18979939285 is 58293997981.

It can be written as a sum of positive squares in 4 ways, for example, as 53333809 + 18926605476 = 7303^2 + 137574^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18979939285 - 2⁹ = 18979938773 is a prime.

It is a super-2 number, since 2×18979939285² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65447922 + ... + 65448211.

It is an arithmetic number, because the mean of its divisors is an integer number (2945163015).

Almost surely, 2^18979939285 is an apocalyptic number.

It is an amenable number.

18979939285 is a deficient number, since it is larger than the sum of its proper divisors (4581364835).

18979939285 is a wasteful number, since it uses less digits than its factorization.

18979939285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130896167.

The product of its digits is 88179840, while the sum is 70.

The spelling of 18979939285 in words is "eighteen billion, nine hundred seventy-nine million, nine hundred thirty-nine thousand, two hundred eighty-five".