198620646423 has 16 divisors (see below), whose sum is σ = 272097926880. Its totient is φ = 128781536256.

The previous prime is 198620646409. The next prime is 198620646439. The reversal of 198620646423 is 324646026891.

It is not a de Polignac number, because 198620646423 - 2⁵ = 198620646391 is a prime.

It is a super-2 number, since 2×198620646423² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198620641423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101878 + ... + 638451.

It is an arithmetic number, because the mean of its divisors is an integer number (17006120430).

Almost surely, 2^198620646423 is an apocalyptic number.

198620646423 is a deficient number, since it is larger than the sum of its proper divisors (73477280457).

198620646423 is a wasteful number, since it uses less digits than its factorization.

198620646423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 742786.

The product of its (nonzero) digits is 2985984, while the sum is 51.

The spelling of 198620646423 in words is "one hundred ninety-eight billion, six hundred twenty million, six hundred forty-six thousand, four hundred twenty-three".