11613821550 has 24 divisors (see below), whose sum is σ = 28802277816. Its totient is φ = 3097019040.

The previous prime is 11613821509. The next prime is 11613821561. The reversal of 11613821550 is 5512831611.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 38712589 + ... + 38712888.

It is an arithmetic number, because the mean of its divisors is an integer number (1200094909).

Almost surely, 2^11613821550 is an apocalyptic number.

11613821550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

11613821550 is an abundant number, since it is smaller than the sum of its proper divisors (17188456266).

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

11613821550 is a wasteful number, since it uses less digits than its factorization.

11613821550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77425492 (or 77425487 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 33.

The spelling of 11613821550 in words is "eleven billion, six hundred thirteen million, eight hundred twenty-one thousand, five hundred fifty".