197851635970561 has 2 divisors, whose sum is σ = 197851635970562. Its totient is φ = 197851635970560.

The previous prime is 197851635970523. The next prime is 197851635970613. The reversal of 197851635970561 is 165079536158791.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 104360914686961 + 93490721283600 = 10215719^2 + 9669060^2 .

It is a cyclic number.

It is not a de Polignac number, because 197851635970561 - 2⁹ = 197851635970049 is a prime.

It is not a weakly prime, because it can be changed into another prime (197851635970361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98925817985280 + 98925817985281.

It is an arithmetic number, because the mean of its divisors is an integer number (98925817985281).

Almost surely, 2^{197851635970561} is an apocalyptic number.

It is an amenable number.

197851635970561 is a deficient number, since it is larger than the sum of its proper divisors (1).

197851635970561 is an equidigital number, since it uses as much as digits as its factorization.

197851635970561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 428652000, while the sum is 73.

The spelling of 197851635970561 in words is "one hundred ninety-seven trillion, eight hundred fifty-one billion, six hundred thirty-five million, nine hundred seventy thousand, five hundred sixty-one".