805026390921 has 6 divisors (see below), whose sum is σ = 1162815898010. Its totient is φ = 536684260608.

The previous prime is 805026390899. The next prime is 805026390997. The reversal of 805026390921 is 129093620508.

805026390921 is a `hidden beast` number, since 8 + 0 + 5 + 0 + 2 + 639 + 0 + 9 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 802565139600 + 2461251321 = 895860^2 + 49611^2 .

It is not a de Polignac number, because 805026390921 - 2³¹ = 802878907273 is a prime.

It is a super-2 number, since 2×805026390921² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (805026190921) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 44723688376 + ... + 44723688393.

Almost surely, 2^805026390921 is an apocalyptic number.

It is an amenable number.

805026390921 is a deficient number, since it is larger than the sum of its proper divisors (357789507089).

805026390921 is a wasteful number, since it uses less digits than its factorization.

805026390921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89447376775 (or 89447376772 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The spelling of 805026390921 in words is "eight hundred five billion, twenty-six million, three hundred ninety thousand, nine hundred twenty-one".