806464249021 has 4 divisors (see below), whose sum is σ = 806466078112. Its totient is φ = 806462419932.

The previous prime is 806464248979. The next prime is 806464249051. The reversal of 806464249021 is 120942464608.

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 cyclic number.

It is not a de Polignac number, because 806464249021 - 2³⁹ = 256708435133 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 (806464249051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197776 + ... + 1285318.

It is an arithmetic number, because the mean of its divisors is an integer number (201616519528).

Almost surely, 2^806464249021 is an apocalyptic number.

It is an amenable number.

806464249021 is a deficient number, since it is larger than the sum of its proper divisors (1829091).

806464249021 is a wasteful number, since it uses less digits than its factorization.

806464249021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1829090.

The product of its (nonzero) digits is 663552, while the sum is 46.

The spelling of 806464249021 in words is "eight hundred six billion, four hundred sixty-four million, two hundred forty-nine thousand, twenty-one".