7885995821 has 4 divisors (see below), whose sum is σ = 8602904544. Its totient is φ = 7169087100.

The previous prime is 7885995811. The next prime is 7885995833. The reversal of 7885995821 is 1285995887.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1285995887 = 11 ⋅116908717.

It is a cyclic number.

It is not a de Polignac number, because 7885995821 - 2⁶ = 7885995757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7885995811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 358454345 + ... + 358454366.

It is an arithmetic number, because the mean of its divisors is an integer number (2150726136).

Almost surely, 2^7885995821 is an apocalyptic number.

It is an amenable number.

7885995821 is a deficient number, since it is larger than the sum of its proper divisors (716908723).

7885995821 is a wasteful number, since it uses less digits than its factorization.

7885995821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 716908722.

The product of its digits is 14515200, while the sum is 62.

The square root of 7885995821 is about 88803.1295676003. The cubic root of 7885995821 is about 1990.4541627325.

The spelling of 7885995821 in words is "seven billion, eight hundred eighty-five million, nine hundred ninety-five thousand, eight hundred twenty-one".