806451621775 has 12 divisors (see below), whose sum is σ = 1000058963112. Its totient is φ = 645123263840.

The previous prime is 806451621769. The next prime is 806451621809. The reversal of 806451621775 is 577126154608.

It is not a de Polignac number, because 806451621775 - 2⁹ = 806451621263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 514357 + ... + 1370206.

It is an arithmetic number, because the mean of its divisors is an integer number (83338246926).

Almost surely, 2^806451621775 is an apocalyptic number.

806451621775 is a deficient number, since it is larger than the sum of its proper divisors (193607341337).

806451621775 is a wasteful number, since it uses less digits than its factorization.

806451621775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1901690 (or 1901685 counting only the distinct ones).

The product of its (nonzero) digits is 2822400, while the sum is 52.

The spelling of 806451621775 in words is "eight hundred six billion, four hundred fifty-one million, six hundred twenty-one thousand, seven hundred seventy-five".