11861870445 has 40 divisors (see below), whose sum is σ = 22514308344. Its totient is φ = 5954190336.

The previous prime is 11861870429. The next prime is 11861870459. The reversal of 11861870445 is 54407816811.

11861870445 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 2014483689 + 9847386756 = 44883^2 + 99234^2 .

It is not a de Polignac number, because 11861870445 - 2⁴ = 11861870429 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 11861870445.

It is a congruent 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 39 ways as a sum of consecutive naturals, for example, 854544 + ... + 868313.

Almost surely, 2^11861870445 is an apocalyptic number.

11861870445 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11861870445 is a deficient number, since it is larger than the sum of its proper divisors (10652437899).

11861870445 is a wasteful number, since it uses less digits than its factorization.

11861870445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1722891 (or 1722882 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 45.

The spelling of 11861870445 in words is "eleven billion, eight hundred sixty-one million, eight hundred seventy thousand, four hundred forty-five".