105065721556 has 24 divisors (see below), whose sum is σ = 184231383336. Its totient is φ = 52428288000.

The previous prime is 105065721529. The next prime is 105065721557. The reversal of 105065721556 is 655127560501.

It can be written as a sum of positive squares in 4 ways, for example, as 34291632400 + 70774089156 = 185180^2 + 266034^2 .

It is a super-2 number, since 2×105065721556² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (105065721557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4365556 + ... + 4389556.

It is an arithmetic number, because the mean of its divisors is an integer number (7676307639).

Almost surely, 2^105065721556 is an apocalyptic number.

It is an amenable number.

105065721556 is a deficient number, since it is larger than the sum of its proper divisors (79165661780).

105065721556 is a wasteful number, since it uses less digits than its factorization.

105065721556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26139 (or 26137 counting only the distinct ones).

The product of its (nonzero) digits is 315000, while the sum is 43.

The spelling of 105065721556 in words is "one hundred five billion, sixty-five million, seven hundred twenty-one thousand, five hundred fifty-six".