15533312120 has 32 divisors (see below), whose sum is σ = 35145219600. Its totient is φ = 6178610688.

The previous prime is 15533312089. The next prime is 15533312173. The reversal of 15533312120 is 2121333551.

It is a self number, because there is not a number n which added to its sum of digits gives 15533312120.

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 7 ways as a sum of consecutive naturals, for example, 1077569 + ... + 1091888.

Almost surely, 2^15533312120 is an apocalyptic number.

15533312120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15533312120 is an abundant number, since it is smaller than the sum of its proper divisors (19611907480).

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

15533312120 is a wasteful number, since it uses less digits than its factorization.

15533312120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2169647 (or 2169643 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 26.

Adding to 15533312120 its reverse (2121333551), we get a palindrome (17654645671).

The spelling of 15533312120 in words is "fifteen billion, five hundred thirty-three million, three hundred twelve thousand, one hundred twenty".