197900977965569 has 2 divisors, whose sum is σ = 197900977965570. Its totient is φ = 197900977965568.

The previous prime is 197900977965547. The next prime is 197900977965617. The reversal of 197900977965569 is 965569779009791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 197385303174544 + 515674791025 = 14049388^2 + 718105^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-197900977965569 is a prime.

It is a super-3 number, since 3×197900977965569³ (a number of 44 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not a weakly prime, because it can be changed into another prime (197900977965529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98950488982784 + 98950488982785.

It is an arithmetic number, because the mean of its divisors is an integer number (98950488982785).

Almost surely, 2^{197900977965569} is an apocalyptic number.

It is an amenable number.

197900977965569 is a deficient number, since it is larger than the sum of its proper divisors (1).

197900977965569 is an equidigital number, since it uses as much as digits as its factorization.

197900977965569 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18228426300, while the sum is 89.

The spelling of 197900977965569 in words is "one hundred ninety-seven trillion, nine hundred billion, nine hundred seventy-seven million, nine hundred sixty-five thousand, five hundred sixty-nine".