198638774460 has 216 divisors, whose sum is σ = 737801784720. Its totient is φ = 43013472768.

The previous prime is 198638774459. The next prime is 198638774461. The reversal of 198638774460 is 64477836891.

198638774460 is a `hidden beast` number, since 1 + 98 + 6 + 3 + 87 + 7 + 4 + 460 = 666.

It is an interprime number because it is at equal distance from previous prime (198638774459) and next prime (198638774461).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198638774461) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 425089 + ... + 760248.

Almost surely, 2^198638774460 is an apocalyptic number.

198638774460 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

198638774460 is an abundant number, since it is smaller than the sum of its proper divisors (539163010260).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

198638774460 is a wasteful number, since it uses less digits than its factorization.

198638774460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1185385 (or 1185373 counting only the distinct ones).

The product of its (nonzero) digits is 48771072, while the sum is 63.

The spelling of 198638774460 in words is "one hundred ninety-eight billion, six hundred thirty-eight million, seven hundred seventy-four thousand, four hundred sixty".