11604651858 has 18 divisors (see below), whose sum is σ = 25144402647. Its totient is φ = 3868064940.

The previous prime is 11604651847. The next prime is 11604651859. The reversal of 11604651858 is 85815640611.

11604651858 is a `hidden beast` number, since 1 + 1 + 6 + 0 + 465 + 185 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 5802325929 + 5802325929 = 76173^2 + 76173^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=76173.

It is not an unprimeable number, because it can be changed into a prime (11604651859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 444343 + ... + 469733.

Almost surely, 2^11604651858 is an apocalyptic number.

11604651858 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

11604651858 is an abundant number, since it is smaller than the sum of its proper divisors (13539750789).

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

11604651858 is an frugal number, since it uses more digits than its factorization.

11604651858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50790 (or 25396 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 45.

The spelling of 11604651858 in words is "eleven billion, six hundred four million, six hundred fifty-one thousand, eight hundred fifty-eight".