840518411461 has 4 divisors (see below), whose sum is σ = 840707423872. Its totient is φ = 840329399052.

The previous prime is 840518411429. The next prime is 840518411507. The reversal of 840518411461 is 164114815048.

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 840518411461 - 2⁵ = 840518411429 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 (840518411561) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94499535 + ... + 94508428.

It is an arithmetic number, because the mean of its divisors is an integer number (210176855968).

Almost surely, 2^840518411461 is an apocalyptic number.

It is an amenable number.

840518411461 is a deficient number, since it is larger than the sum of its proper divisors (189012411).

840518411461 is a wasteful number, since it uses less digits than its factorization.

840518411461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189012410.

The product of its (nonzero) digits is 122880, while the sum is 43.

The spelling of 840518411461 in words is "eight hundred forty billion, five hundred eighteen million, four hundred eleven thousand, four hundred sixty-one".