805552998921 has 48 divisors (see below), whose sum is σ = 1347207526080. Its totient is φ = 462518337600.

The previous prime is 805552998917. The next prime is 805552998937. The reversal of 805552998921 is 129899255508.

805552998921 is a `hidden beast` number, since 8 + 0 + 5 + 5 + 529 + 9 + 89 + 21 = 666.

805552998921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 805552998921 - 2² = 805552998917 is a prime.

It is not an unprimeable number, because it can be changed into a prime (801552998921) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1542060 + ... + 1997261.

It is an arithmetic number, because the mean of its divisors is an integer number (28066823460).

Almost surely, 2^805552998921 is an apocalyptic number.

It is an amenable number.

805552998921 is a deficient number, since it is larger than the sum of its proper divisors (541654527159).

805552998921 is a wasteful number, since it uses less digits than its factorization.

805552998921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3539379 (or 3539354 counting only the distinct ones).

The product of its (nonzero) digits is 23328000, while the sum is 63.

The spelling of 805552998921 in words is "eight hundred five billion, five hundred fifty-two million, nine hundred ninety-eight thousand, nine hundred twenty-one".