840557551811 has 4 divisors (see below), whose sum is σ = 841358847000. Its totient is φ = 839756256624.

The previous prime is 840557551759. The next prime is 840557551837. The reversal of 840557551811 is 118155755048.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 840557551811 - 2¹⁴ = 840557535427 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 840557551811.

It is not an unprimeable number, because it can be changed into a prime (840557551861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 400646021 + ... + 400648118.

It is an arithmetic number, because the mean of its divisors is an integer number (210339711750).

Almost surely, 2^840557551811 is an apocalyptic number.

840557551811 is a deficient number, since it is larger than the sum of its proper divisors (801295189).

840557551811 is a wasteful number, since it uses less digits than its factorization.

840557551811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 801295188.

The product of its (nonzero) digits is 1120000, while the sum is 50.

The spelling of 840557551811 in words is "eight hundred forty billion, five hundred fifty-seven million, five hundred fifty-one thousand, eight hundred eleven".