15561223032 has 32 divisors (see below), whose sum is σ = 39018517200. Its totient is φ = 5171679744.

The previous prime is 15561223019. The next prime is 15561223033. The reversal of 15561223032 is 23032216551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15561223033) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 953907 + ... + 970082.

Almost surely, 2^15561223032 is an apocalyptic number.

15561223032 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

15561223032 is an abundant number, since it is smaller than the sum of its proper divisors (23457294168).

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

15561223032 is a wasteful number, since it uses less digits than its factorization.

15561223032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1924335 (or 1924331 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 30.

Adding to 15561223032 its reverse (23032216551), we get a palindrome (38593439583).

The spelling of 15561223032 in words is "fifteen billion, five hundred sixty-one million, two hundred twenty-three thousand, thirty-two".