1995617865 has 16 divisors (see below), whose sum is σ = 3195952128. Its totient is φ = 1063341696.

The previous prime is 1995617849. The next prime is 1995617873. The reversal of 1995617865 is 5687165991.

It is not a de Polignac number, because 1995617865 - 2⁴ = 1995617849 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44892 + ... + 77501.

It is an arithmetic number, because the mean of its divisors is an integer number (199747008).

Almost surely, 2^1995617865 is an apocalyptic number.

1995617865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1995617865 is a deficient number, since it is larger than the sum of its proper divisors (1200334263).

1995617865 is a wasteful number, since it uses less digits than its factorization.

1995617865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123488.

The product of its digits is 4082400, while the sum is 57.

The square root of 1995617865 is about 44672.3389246634. The cubic root of 1995617865 is about 1259.0001863206. Note that the first 3 decimals are identical.

The spelling of 1995617865 in words is "one billion, nine hundred ninety-five million, six hundred seventeen thousand, eight hundred sixty-five".