11856541858 has 24 divisors (see below), whose sum is σ = 20692226412. Its totient is φ = 5080449024.

The previous prime is 11856541847. The next prime is 11856541877. The reversal of 11856541858 is 85814565811.

It can be written as a sum of positive squares in 2 ways, for example, as 11834611369 + 21930489 = 108787^2 + 4683^2 .

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

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, 1000866 + ... + 1012642.

Almost surely, 2^11856541858 is an apocalyptic number.

11856541858 is a deficient number, since it is larger than the sum of its proper divisors (8835684554).

11856541858 is a wasteful number, since it uses less digits than its factorization.

11856541858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22066 (or 22059 counting only the distinct ones).

The product of its digits is 1536000, while the sum is 52.

The spelling of 11856541858 in words is "eleven billion, eight hundred fifty-six million, five hundred forty-one thousand, eight hundred fifty-eight".