197677943656 has 8 divisors (see below), whose sum is σ = 370646144370. Its totient is φ = 98838971824.

The previous prime is 197677943651. The next prime is 197677943677. The reversal of 197677943656 is 656349776791.

It can be written as a sum of positive squares in only one way, i.e., 172004290756 + 25673652900 = 414734^2 + 160230^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (197677943651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12354871471 + ... + 12354871486.

Almost surely, 2^197677943656 is an apocalyptic number.

It is an amenable number.

197677943656 is a deficient number, since it is larger than the sum of its proper divisors (172968200714).

197677943656 is a wasteful number, since it uses less digits than its factorization.

197677943656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24709742963 (or 24709742959 counting only the distinct ones).

The product of its digits is 360067680, while the sum is 70.

The spelling of 197677943656 in words is "one hundred ninety-seven billion, six hundred seventy-seven million, nine hundred forty-three thousand, six hundred fifty-six".