19198897679 has 8 divisors (see below), whose sum is σ = 20678203392. Its totient is φ = 17719944480.

The previous prime is 19198897673. The next prime is 19198897703. The reversal of 19198897679 is 97679889191.

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 19198897679 - 2¹² = 19198893583 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 (19198897673) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30962 + ... + 198384.

It is an arithmetic number, because the mean of its divisors is an integer number (2584775424).

Almost surely, 2^19198897679 is an apocalyptic number.

19198897679 is a deficient number, since it is larger than the sum of its proper divisors (1479305713).

19198897679 is a wasteful number, since it uses less digits than its factorization.

19198897679 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176257.

The product of its digits is 123451776, while the sum is 74.

The spelling of 19198897679 in words is "nineteen billion, one hundred ninety-eight million, eight hundred ninety-seven thousand, six hundred seventy-nine".