809251395945 has 16 divisors (see below), whose sum is σ = 1316748035520. Its totient is φ = 424285477184.

The previous prime is 809251395943. The next prime is 809251395949. The reversal of 809251395945 is 549593152908.

809251395945 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 809251395945 - 2¹ = 809251395943 is a prime.

It is a super-3 number, since 3×809251395945³ (a number of 37 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (809251395943) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 457203294 + ... + 457205063.

It is an arithmetic number, because the mean of its divisors is an integer number (82296752220).

Almost surely, 2^809251395945 is an apocalyptic number.

It is an amenable number.

809251395945 is a deficient number, since it is larger than the sum of its proper divisors (507496639575).

809251395945 is a wasteful number, since it uses less digits than its factorization.

809251395945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 914408424.

The product of its (nonzero) digits is 17496000, while the sum is 60.

The spelling of 809251395945 in words is "eight hundred nine billion, two hundred fifty-one million, three hundred ninety-five thousand, nine hundred forty-five".