11923678658550 has 96 divisors (see below), whose sum is σ = 30073843186560. Its totient is φ = 3125555596800.

The previous prime is 11923678658531. The next prime is 11923678658557. The reversal of 11923678658550 is 5585687632911.

It is a super-2 number, since 2×11923678658550² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11923678658557) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 181949790 + ... + 182015310.

It is an arithmetic number, because the mean of its divisors is an integer number (313269199860).

Almost surely, 2^{11923678658550} is an apocalyptic number.

11923678658550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 11923678658550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15036921593280).

11923678658550 is an abundant number, since it is smaller than the sum of its proper divisors (18150164528010).

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

11923678658550 is a wasteful number, since it uses less digits than its factorization.

11923678658550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86158 (or 86153 counting only the distinct ones).

The product of its (nonzero) digits is 108864000, while the sum is 66.

The spelling of 11923678658550 in words is "eleven trillion, nine hundred twenty-three billion, six hundred seventy-eight million, six hundred fifty-eight thousand, five hundred fifty".