198694352640 has 288 divisors, whose sum is σ = 730052176896. Its totient is φ = 45114163200.

The previous prime is 198694352627. The next prime is 198694352699. The reversal of 198694352640 is 46253496891.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4034404 + ... + 4083356.

It is an arithmetic number, because the mean of its divisors is an integer number (2534903392).

Almost surely, 2^198694352640 is an apocalyptic number.

198694352640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 198694352640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (365026088448).

198694352640 is an abundant number, since it is smaller than the sum of its proper divisors (531357824256).

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

198694352640 is a wasteful number, since it uses less digits than its factorization.

198694352640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49135 (or 49121 counting only the distinct ones).

The product of its (nonzero) digits is 11197440, while the sum is 57.

The spelling of 198694352640 in words is "one hundred ninety-eight billion, six hundred ninety-four million, three hundred fifty-two thousand, six hundred forty".