809774540245 has 32 divisors (see below), whose sum is σ = 1152761331456. Its totient is φ = 539303500800.

The previous prime is 809774540209. The next prime is 809774540249. The reversal of 809774540245 is 542045477908.

It is not a de Polignac number, because 809774540245 - 2⁹ = 809774539733 is a prime.

It is a super-2 number, since 2×809774540245² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (809774540249) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11669041 + ... + 11738230.

It is an arithmetic number, because the mean of its divisors is an integer number (36023791608).

Almost surely, 2^809774540245 is an apocalyptic number.

809774540245 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

809774540245 is a deficient number, since it is larger than the sum of its proper divisors (342986791211).

809774540245 is a wasteful number, since it uses less digits than its factorization.

809774540245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23407341.

The product of its (nonzero) digits is 11289600, while the sum is 55.

The spelling of 809774540245 in words is "eight hundred nine billion, seven hundred seventy-four million, five hundred forty thousand, two hundred forty-five".