1995878785969 has 2 divisors, whose sum is σ = 1995878785970. Its totient is φ = 1995878785968.

The previous prime is 1995878785961. The next prime is 1995878785991. The reversal of 1995878785969 is 9695878785991.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1801133095969 + 194745690000 = 1342063^2 + 441300^2 .

It is a cyclic number.

It is not a de Polignac number, because 1995878785969 - 2³ = 1995878785961 is a prime.

It is a super-2 number, since 2×1995878785969² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1995878785961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 997939392984 + 997939392985.

It is an arithmetic number, because the mean of its divisors is an integer number (997939392985).

Almost surely, 2^{1995878785969} is an apocalyptic number.

It is an amenable number.

1995878785969 is a deficient number, since it is larger than the sum of its proper divisors (1).

1995878785969 is an equidigital number, since it uses as much as digits as its factorization.

1995878785969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24690355200, while the sum is 91.

The spelling of 1995878785969 in words is "one trillion, nine hundred ninety-five billion, eight hundred seventy-eight million, seven hundred eighty-five thousand, nine hundred sixty-nine".