995433986821 has 4 divisors (see below), whose sum is σ = 995436290944. Its totient is φ = 995431682700.

The previous prime is 995433986741. The next prime is 995433986849. The reversal of 995433986821 is 128689334599.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a 3-Lehmer number, since φ(995433986821) divides (995433986821-1)³.

It is a cyclic number.

It is not a de Polignac number, because 995433986821 - 2⁷ = 995433986693 is a prime.

It is a deceptive number, since it divides R_995433986820.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (995433986881) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 288015 + ... + 1440076.

It is an arithmetic number, because the mean of its divisors is an integer number (248859072736).

It is a Poulet number, since it divides 2^995433986820-1.

Almost surely, 2^995433986821 is an apocalyptic number.

995433986821 is the 576031-st octagonal number.

It is an amenable number.

995433986821 is a deficient number, since it is larger than the sum of its proper divisors (2304123).

995433986821 is a wasteful number, since it uses less digits than its factorization.

995433986821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2304122.

The product of its digits is 100776960, while the sum is 67.

The spelling of 995433986821 in words is "nine hundred ninety-five billion, four hundred thirty-three million, nine hundred eighty-six thousand, eight hundred twenty-one".