1995117155 has 16 divisors (see below), whose sum is σ = 2437344000. Its totient is φ = 1567350240.

The previous prime is 1995117151. The next prime is 1995117169. The reversal of 1995117155 is 5517115991.

It is not a de Polignac number, because 1995117155 - 2² = 1995117151 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1995117151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 318746 + ... + 324944.

It is an arithmetic number, because the mean of its divisors is an integer number (152334000).

Almost surely, 2^1995117155 is an apocalyptic number.

1995117155 is a deficient number, since it is larger than the sum of its proper divisors (442226845).

1995117155 is a wasteful number, since it uses less digits than its factorization.

1995117155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7354.

The product of its digits is 70875, while the sum is 44.

The square root of 1995117155 is about 44666.7343220881. The cubic root of 1995117155 is about 1258.8948811376.

The spelling of 1995117155 in words is "one billion, nine hundred ninety-five million, one hundred seventeen thousand, one hundred fifty-five".