1198817134578 has 768 divisors, whose sum is σ = 3487131648000. Its totient is φ = 300975429888.

The previous prime is 1198817134573. The next prime is 1198817134631. The reversal of 1198817134578 is 8754317188911.

1198817134578 is a `hidden beast` number, since 1 + 1 + 9 + 8 + 8 + 171 + 3 + 457 + 8 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (1198817134573) by changing a digit.

It is a polite number, since it can be written in 383 ways as a sum of consecutive naturals, for example, 8624583633 + ... + 8624583771.

It is an arithmetic number, because the mean of its divisors is an integer number (4540536000).

Almost surely, 2^{1198817134578} is an apocalyptic number.

1198817134578 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1198817134578, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1743565824000).

1198817134578 is an abundant number, since it is smaller than the sum of its proper divisors (2288314513422).

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

1198817134578 is a wasteful number, since it uses less digits than its factorization.

1198817134578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361 (or 349 counting only the distinct ones).

The product of its digits is 13547520, while the sum is 63.

The spelling of 1198817134578 in words is "one trillion, one hundred ninety-eight billion, eight hundred seventeen million, one hundred thirty-four thousand, five hundred seventy-eight".