198997913719 has 4 divisors (see below), whose sum is σ = 217088633160. Its totient is φ = 180907194280.

The previous prime is 198997913677. The next prime is 198997913729. The reversal of 198997913719 is 917319799891.

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 198997913719 - 2²⁵ = 198964359287 is a prime.

It is a super-2 number, since 2×198997913719² (a number of 23 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 (198997913729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9045359704 + ... + 9045359725.

It is an arithmetic number, because the mean of its divisors is an integer number (54272158290).

Almost surely, 2^198997913719 is an apocalyptic number.

198997913719 is a deficient number, since it is larger than the sum of its proper divisors (18090719441).

198997913719 is a wasteful number, since it uses less digits than its factorization.

198997913719 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18090719440.

The product of its digits is 69441624, while the sum is 73.

The spelling of 198997913719 in words is "one hundred ninety-eight billion, nine hundred ninety-seven million, nine hundred thirteen thousand, seven hundred nineteen".