197978586000 has 640 divisors, whose sum is σ = 727225454592. Its totient is φ = 45987840000.

The previous prime is 197978585993. The next prime is 197978586011. The reversal of 197978586000 is 685879791.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 99137002 + ... + 99138998.

Almost surely, 2^197978586000 is an apocalyptic number.

197978586000 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 197978586000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (363612727296).

197978586000 is an abundant number, since it is smaller than the sum of its proper divisors (529246868592).

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

197978586000 is a wasteful number, since it uses less digits than its factorization.

197978586000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2108 (or 2092 counting only the distinct ones).

The product of its (nonzero) digits is 7620480, while the sum is 60.

The spelling of 197978586000 in words is "one hundred ninety-seven billion, nine hundred seventy-eight million, five hundred eighty-six thousand".