840609395061 has 4 divisors (see below), whose sum is σ = 1120812526752. Its totient is φ = 560406263372.

The previous prime is 840609395023. The next prime is 840609395063. The reversal of 840609395061 is 160593906048.

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 840609395061 - 2²¹ = 840607297909 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 840609394995 and 840609395013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840609395063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140101565841 + ... + 140101565846.

It is an arithmetic number, because the mean of its divisors is an integer number (280203131688).

Almost surely, 2^840609395061 is an apocalyptic number.

It is an amenable number.

840609395061 is a deficient number, since it is larger than the sum of its proper divisors (280203131691).

840609395061 is a wasteful number, since it uses less digits than its factorization.

840609395061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280203131690.

The product of its (nonzero) digits is 1399680, while the sum is 51.

The spelling of 840609395061 in words is "eight hundred forty billion, six hundred nine million, three hundred ninety-five thousand, sixty-one".