18778679857 has 8 divisors (see below), whose sum is σ = 21475452096. Its totient is φ = 16085433552.

The previous prime is 18778679837. The next prime is 18778679869. The reversal of 18778679857 is 75897687781.

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 18778679857 - 2¹¹ = 18778677809 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18778679857.

It is not an unprimeable number, because it can be changed into a prime (18778679837) by changing a digit.

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, 870058 + ... + 891379.

It is an arithmetic number, because the mean of its divisors is an integer number (2684431512).

Almost surely, 2^18778679857 is an apocalyptic number.

It is an amenable number.

18778679857 is a deficient number, since it is larger than the sum of its proper divisors (2696772239).

18778679857 is a wasteful number, since it uses less digits than its factorization.

18778679857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1762967.

The product of its digits is 331914240, while the sum is 73.

The spelling of 18778679857 in words is "eighteen billion, seven hundred seventy-eight million, six hundred seventy-nine thousand, eight hundred fifty-seven".