15535221044 has 24 divisors (see below), whose sum is σ = 32898116160. Its totient is φ = 6266307456.

The previous prime is 15535221011. The next prime is 15535221059. The reversal of 15535221044 is 44012253551.

It is a self number, because there is not a number n which added to its sum of digits gives 15535221044.

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, 16318034 + ... + 16318985.

It is an arithmetic number, because the mean of its divisors is an integer number (1370754840).

Almost surely, 2^15535221044 is an apocalyptic number.

15535221044 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

15535221044 is an abundant number, since it is smaller than the sum of its proper divisors (17362895116).

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

15535221044 is a wasteful number, since it uses less digits than its factorization.

15535221044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32637047 (or 32637045 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 32.

Adding to 15535221044 its reverse (44012253551), we get a palindrome (59547474595).

The spelling of 15535221044 in words is "fifteen billion, five hundred thirty-five million, two hundred twenty-one thousand, forty-four".