11855725065 has 12 divisors (see below), whose sum is σ = 20549923524. Its totient is φ = 6323053344.

The previous prime is 11855725039. The next prime is 11855725093. The reversal of 11855725065 is 56052755811.

11855725065 is a `hidden beast` number, since 1 + 18 + 5 + 572 + 5 + 0 + 65 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 7280014329 + 4575710736 = 85323^2 + 67644^2 .

It is not a de Polignac number, because 11855725065 - 2⁹ = 11855724553 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 263460557 = 11855725065 / (1 + 1 + 8 + 5 + 5 + 7 + 2 + 5 + 0 + 6 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 11855725065.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 131730234 + ... + 131730323.

It is an arithmetic number, because the mean of its divisors is an integer number (1712493627).

Almost surely, 2^11855725065 is an apocalyptic number.

11855725065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11855725065 is a deficient number, since it is larger than the sum of its proper divisors (8694198459).

11855725065 is a wasteful number, since it uses less digits than its factorization.

11855725065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263460568 (or 263460565 counting only the distinct ones).

The product of its (nonzero) digits is 420000, while the sum is 45.

The spelling of 11855725065 in words is "eleven billion, eight hundred fifty-five million, seven hundred twenty-five thousand, sixty-five".