11661223231252 has 12 divisors (see below), whose sum is σ = 23322446462560. Its totient is φ = 4997667099096.

The previous prime is 11661223231249. The next prime is 11661223231289. The reversal of 11661223231252 is 25213232216611.

It is a happy number.

11661223231252 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

11661223231252 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 208236129102 + ... + 208236129157.

Almost surely, 2^{11661223231252} is an apocalyptic number.

It is an amenable number.

11661223231252 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

11661223231252 is a wasteful number, since it uses less digits than its factorization.

11661223231252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416472258270 (or 416472258268 counting only the distinct ones).

The product of its digits is 51840, while the sum is 37.

Adding to 11661223231252 its reverse (25213232216611), we get a palindrome (36874455447863).

The spelling of 11661223231252 in words is "eleven trillion, six hundred sixty-one billion, two hundred twenty-three million, two hundred thirty-one thousand, two hundred fifty-two".