197991636930 has 128 divisors (see below), whose sum is σ = 558589996800. Its totient is φ = 49764782592.

The previous prime is 197991636923. The next prime is 197991636961. The reversal of 197991636930 is 39636199791.

197991636930 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 912654 + ... + 1108566.

It is an arithmetic number, because the mean of its divisors is an integer number (4363984350).

Almost surely, 2^197991636930 is an apocalyptic number.

197991636930 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 197991636930, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (279294998400).

197991636930 is an abundant number, since it is smaller than the sum of its proper divisors (360598359870).

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

197991636930 is a wasteful number, since it uses less digits than its factorization.

197991636930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196145 (or 196139 counting only the distinct ones).

The product of its (nonzero) digits is 14880348, while the sum is 63.

The spelling of 197991636930 in words is "one hundred ninety-seven billion, nine hundred ninety-one million, six hundred thirty-six thousand, nine hundred thirty".