198997913729 has 2 divisors, whose sum is σ = 198997913730. Its totient is φ = 198997913728.

The previous prime is 198997913677. The next prime is 198997913743. The reversal of 198997913729 is 927319799891.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 180297898225 + 18700015504 = 424615^2 + 136748^2 .

It is a cyclic number.

It is not a de Polignac number, because 198997913729 - 2²⁸ = 198729478273 is a prime.

It is not a weakly prime, because it can be changed into another prime (198997913629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99498956864 + 99498956865.

It is an arithmetic number, because the mean of its divisors is an integer number (99498956865).

Almost surely, 2^198997913729 is an apocalyptic number.

It is an amenable number.

198997913729 is a deficient number, since it is larger than the sum of its proper divisors (1).

198997913729 is an equidigital number, since it uses as much as digits as its factorization.

198997913729 is an evil number, because the sum of its binary digits is even.

The product of its digits is 138883248, while the sum is 74.

The spelling of 198997913729 in words is "one hundred ninety-eight billion, nine hundred ninety-seven million, nine hundred thirteen thousand, seven hundred twenty-nine".