861948841745 has 8 divisors (see below), whose sum is σ = 1041888527784. Its totient is φ = 684525794944.

The previous prime is 861948841711. The next prime is 861948841753. The reversal of 861948841745 is 547148849168.

It is a Cunningham number, because it is equal to 928412²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 310302474304 + 551646367441 = 557048^2 + 742729^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 861948841745 - 2¹⁶ = 861948776209 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 629159054 + ... + 629160423.

It is an arithmetic number, because the mean of its divisors is an integer number (130236065973).

Almost surely, 2^861948841745 is an apocalyptic number.

It is an amenable number.

861948841745 is a deficient number, since it is larger than the sum of its proper divisors (179939686039).

861948841745 is a wasteful number, since it uses less digits than its factorization.

861948841745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1258319619.

The product of its digits is 61931520, while the sum is 65.

The spelling of 861948841745 in words is "eight hundred sixty-one billion, nine hundred forty-eight million, eight hundred forty-one thousand, seven hundred forty-five".