861849542005 has 16 divisors (see below), whose sum is σ = 1062398824704. Its totient is φ = 670701366720.

The previous prime is 861849541951. The next prime is 861849542023. The reversal of 861849542005 is 500245948168.

It is not a de Polignac number, because 861849542005 - 2¹⁹ = 861849017717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 371284 + ... + 1364386.

It is an arithmetic number, because the mean of its divisors is an integer number (66399926544).

Almost surely, 2^861849542005 is an apocalyptic number.

It is an amenable number.

861849542005 is a deficient number, since it is larger than the sum of its proper divisors (200549282699).

861849542005 is a wasteful number, since it uses less digits than its factorization.

861849542005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 997836.

The product of its (nonzero) digits is 2764800, while the sum is 52.

The spelling of 861849542005 in words is "eight hundred sixty-one billion, eight hundred forty-nine million, five hundred forty-two thousand, five".