198638205464 has 32 divisors (see below), whose sum is σ = 378594786240. Its totient is φ = 97679961600.

The previous prime is 198638205443. The next prime is 198638205481. The reversal of 198638205464 is 464502836891.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5909024 + ... + 5942544.

It is an arithmetic number, because the mean of its divisors is an integer number (11831087070).

Almost surely, 2^198638205464 is an apocalyptic number.

It is an amenable number.

198638205464 is a deficient number, since it is larger than the sum of its proper divisors (179956580776).

198638205464 is a wasteful number, since it uses less digits than its factorization.

198638205464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45731 (or 45727 counting only the distinct ones).

The product of its (nonzero) digits is 9953280, while the sum is 56.

The spelling of 198638205464 in words is "one hundred ninety-eight billion, six hundred thirty-eight million, two hundred five thousand, four hundred sixty-four".