11856345558 has 16 divisors (see below), whose sum is σ = 24530370480. Its totient is φ = 3815835296.

The previous prime is 11856345539. The next prime is 11856345559. The reversal of 11856345558 is 85554365811.

It is a happy number.

It is a super-3 number, since 3×11856345558³ (a number of 31 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 11856345558.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11856345559) 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, 34069785 + ... + 34070132.

It is an arithmetic number, because the mean of its divisors is an integer number (1533148155).

Almost surely, 2^11856345558 is an apocalyptic number.

11856345558 is an abundant number, since it is smaller than the sum of its proper divisors (12674024922).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11856345558 is a wasteful number, since it uses less digits than its factorization.

11856345558 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68139951.

The product of its digits is 2880000, while the sum is 51.

The spelling of 11856345558 in words is "eleven billion, eight hundred fifty-six million, three hundred forty-five thousand, five hundred fifty-eight".