197556562943977 has 2 divisors, whose sum is σ = 197556562943978. Its totient is φ = 197556562943976.

The previous prime is 197556562943947. The next prime is 197556562943981. The reversal of 197556562943977 is 779349265655791.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 114981249230761 + 82575313713216 = 10722931^2 + 9087096^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-197556562943977 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 197556562943894 and 197556562943903.

It is not a weakly prime, because it can be changed into another prime (197556562943947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98778281471988 + 98778281471989.

It is an arithmetic number, because the mean of its divisors is an integer number (98778281471989).

Almost surely, 2^{197556562943977} is an apocalyptic number.

It is an amenable number.

197556562943977 is a deficient number, since it is larger than the sum of its proper divisors (1).

197556562943977 is an equidigital number, since it uses as much as digits as its factorization.

197556562943977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27005076000, while the sum is 85.

The spelling of 197556562943977 in words is "one hundred ninety-seven trillion, five hundred fifty-six billion, five hundred sixty-two million, nine hundred forty-three thousand, nine hundred seventy-seven".