1995245956209 has 32 divisors (see below), whose sum is σ = 3028491270144. Its totient is φ = 1156613230080.

The previous prime is 1995245956147. The next prime is 1995245956219. The reversal of 1995245956209 is 9026595425991.

It is not a de Polignac number, because 1995245956209 - 2¹¹ = 1995245954161 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1995245956209.

It is not an unprimeable number, because it can be changed into a prime (1995245956219) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23347452 + ... + 23432754.

It is an arithmetic number, because the mean of its divisors is an integer number (94640352192).

Almost surely, 2^{1995245956209} is an apocalyptic number.

It is an amenable number.

1995245956209 is a deficient number, since it is larger than the sum of its proper divisors (1033245313935).

1995245956209 is a wasteful number, since it uses less digits than its factorization.

1995245956209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116157.

The product of its (nonzero) digits is 78732000, while the sum is 66.

The spelling of 1995245956209 in words is "one trillion, nine hundred ninety-five billion, two hundred forty-five million, nine hundred fifty-six thousand, two hundred nine".