995503481721 has 56 divisors (see below), whose sum is σ = 1742091043584. Its totient is φ = 556755612480.

The previous prime is 995503481717. The next prime is 995503481761. The reversal of 995503481721 is 127184305599.

It is a happy number.

995503481721 is a `hidden beast` number, since 9 + 9 + 550 + 3 + 4 + 81 + 7 + 2 + 1 = 666.

It is not a de Polignac number, because 995503481721 - 2² = 995503481717 is a prime.

It is a super-2 number, since 2×995503481721² (a number of 25 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (995503481701) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 1835500 + ... + 2315181.

Almost surely, 2^995503481721 is an apocalyptic number.

It is an amenable number.

995503481721 is a deficient number, since it is larger than the sum of its proper divisors (746587561863).

995503481721 is an equidigital number, since it uses as much as digits as its factorization.

995503481721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4150753 (or 4150738 counting only the distinct ones).

The product of its (nonzero) digits is 2721600, while the sum is 54.

The spelling of 995503481721 in words is "nine hundred ninety-five billion, five hundred three million, four hundred eighty-one thousand, seven hundred twenty-one".