197668677940 has 12 divisors (see below), whose sum is σ = 415104223716. Its totient is φ = 79067471168.

The previous prime is 197668677911. The next prime is 197668677949. The reversal of 197668677940 is 49776866791.

It can be written as a sum of positive squares in 2 ways, for example, as 90349538724 + 107319139216 = 300582^2 + 327596^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 197668677940.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197668677949) 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, 4941716929 + ... + 4941716968.

It is an arithmetic number, because the mean of its divisors is an integer number (34592018643).

Almost surely, 2^197668677940 is an apocalyptic number.

197668677940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

197668677940 is an abundant number, since it is smaller than the sum of its proper divisors (217435545776).

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

197668677940 is a wasteful number, since it uses less digits than its factorization.

197668677940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9883433906 (or 9883433904 counting only the distinct ones).

The product of its (nonzero) digits is 192036096, while the sum is 70.

The spelling of 197668677940 in words is "one hundred ninety-seven billion, six hundred sixty-eight million, six hundred seventy-seven thousand, nine hundred forty".