197618775990 has 128 divisors (see below), whose sum is σ = 510114240000. Its totient is φ = 48848126976.

The previous prime is 197618775989. The next prime is 197618776133. The reversal of 197618775990 is 99577816791.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5672946 + ... + 5707674.

It is an arithmetic number, because the mean of its divisors is an integer number (3985267500).

Almost surely, 2^197618775990 is an apocalyptic number.

197618775990 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 197618775990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (255057120000).

197618775990 is an abundant number, since it is smaller than the sum of its proper divisors (312495464010).

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

197618775990 is a wasteful number, since it uses less digits than its factorization.

197618775990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34974.

The product of its (nonzero) digits is 60011280, while the sum is 69.

The spelling of 197618775990 in words is "one hundred ninety-seven billion, six hundred eighteen million, seven hundred seventy-five thousand, nine hundred ninety".