197690449820 has 12 divisors (see below), whose sum is σ = 415149944664. Its totient is φ = 79076179920.

The previous prime is 197690449787. The next prime is 197690449829. The reversal of 197690449820 is 28944096791.

It is a hoax number, since the sum of its digits (59) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 197690449820.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197690449829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4942261226 + ... + 4942261265.

It is an arithmetic number, because the mean of its divisors is an integer number (34595828722).

Almost surely, 2^197690449820 is an apocalyptic number.

197690449820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

197690449820 is an abundant number, since it is smaller than the sum of its proper divisors (217459494844).

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

197690449820 is a wasteful number, since it uses less digits than its factorization.

197690449820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9884522500 (or 9884522498 counting only the distinct ones).

The product of its (nonzero) digits is 7838208, while the sum is 59.

The spelling of 197690449820 in words is "one hundred ninety-seven billion, six hundred ninety million, four hundred forty-nine thousand, eight hundred twenty".