11885645506 has 36 divisors (see below), whose sum is σ = 21967418214. Its totient is φ = 4792415040.

The previous prime is 11885645479. The next prime is 11885645537. The reversal of 11885645506 is 60554658811.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 8739445225 + 3146200281 = 93485^2 + 56091^2 .

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a self number, because there is not a number n which added to its sum of digits gives 11885645506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4448551 + ... + 4451221.

Almost surely, 2^11885645506 is an apocalyptic number.

11885645506 is a deficient number, since it is larger than the sum of its proper divisors (10081772708).

11885645506 is an frugal number, since it uses more digits than its factorization.

11885645506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5375 (or 2697 counting only the distinct ones).

The product of its (nonzero) digits is 1152000, while the sum is 49.

The spelling of 11885645506 in words is "eleven billion, eight hundred eighty-five million, six hundred forty-five thousand, five hundred six".