195266972987 has 2 divisors, whose sum is σ = 195266972988. Its totient is φ = 195266972986.

The previous prime is 195266972963. The next prime is 195266973079. The reversal of 195266972987 is 789279662591.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 195266972987 - 2²⁰ = 195265924411 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 195266972987.

It is not a weakly prime, because it can be changed into another prime (195266972287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97633486493 + 97633486494.

It is an arithmetic number, because the mean of its divisors is an integer number (97633486494).

Almost surely, 2^195266972987 is an apocalyptic number.

195266972987 is a deficient number, since it is larger than the sum of its proper divisors (1).

195266972987 is an equidigital number, since it uses as much as digits as its factorization.

195266972987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 205752960, while the sum is 71.

The spelling of 195266972987 in words is "one hundred ninety-five billion, two hundred sixty-six million, nine hundred seventy-two thousand, nine hundred eighty-seven".