198745581623 has 2 divisors, whose sum is σ = 198745581624. Its totient is φ = 198745581622.

The previous prime is 198745581613. The next prime is 198745581689. The reversal of 198745581623 is 326185547891.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 198745581623 - 2²² = 198741387319 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (198745581613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 99372790811 + 99372790812.

It is an arithmetic number, because the mean of its divisors is an integer number (99372790812).

Almost surely, 2^198745581623 is an apocalyptic number.

198745581623 is a deficient number, since it is larger than the sum of its proper divisors (1).

198745581623 is an equidigital number, since it uses as much as digits as its factorization.

198745581623 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14515200, while the sum is 59.

The spelling of 198745581623 in words is "one hundred ninety-eight billion, seven hundred forty-five million, five hundred eighty-one thousand, six hundred twenty-three".