19874164679 has 4 divisors (see below), whose sum is σ = 19887676800. Its totient is φ = 19860652560.

The previous prime is 19874164637. The next prime is 19874164703. The reversal of 19874164679 is 97646147891.

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

It is a cyclic number.

It is not a de Polignac number, because 19874164679 - 2¹⁶ = 19874099143 is a prime.

It is a super-2 number, since 2×19874164679² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19874166679) 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 3 ways as a sum of consecutive naturals, for example, 6753854 + ... + 6756795.

It is an arithmetic number, because the mean of its divisors is an integer number (4971919200).

Almost surely, 2^19874164679 is an apocalyptic number.

19874164679 is a deficient number, since it is larger than the sum of its proper divisors (13512121).

19874164679 is a wasteful number, since it uses less digits than its factorization.

19874164679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13512120.

The product of its digits is 18289152, while the sum is 62.

The spelling of 19874164679 in words is "nineteen billion, eight hundred seventy-four million, one hundred sixty-four thousand, six hundred seventy-nine".