197787821382 has 16 divisors (see below), whose sum is σ = 439528492080. Its totient is φ = 65929273776.

The previous prime is 197787821377. The next prime is 197787821389. The reversal of 197787821382 is 283128787791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197787821389) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1831368663 + ... + 1831368770.

It is an arithmetic number, because the mean of its divisors is an integer number (27470530755).

Almost surely, 2^197787821382 is an apocalyptic number.

197787821382 is an abundant number, since it is smaller than the sum of its proper divisors (241740670698).

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

197787821382 is a wasteful number, since it uses less digits than its factorization.

197787821382 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3662737444 (or 3662737438 counting only the distinct ones).

The product of its digits is 18966528, while the sum is 63.

The spelling of 197787821382 in words is "one hundred ninety-seven billion, seven hundred eighty-seven million, eight hundred twenty-one thousand, three hundred eighty-two".