15540344432 has 20 divisors (see below), whose sum is σ = 30112443960. Its totient is φ = 7769391168.

The previous prime is 15540344363. The next prime is 15540344447. The reversal of 15540344432 is 23444304551.

It is a junction number, because it is equal to n+sod(n) for n = 15540344392 and 15540344401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 136694 + ... + 223082.

It is an arithmetic number, because the mean of its divisors is an integer number (1505622198).

Almost surely, 2^15540344432 is an apocalyptic number.

It is an amenable number.

15540344432 is a deficient number, since it is larger than the sum of its proper divisors (14572099528).

15540344432 is a wasteful number, since it uses less digits than its factorization.

15540344432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97640 (or 97634 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 35.

Adding to 15540344432 its reverse (23444304551), we get a palindrome (38984648983).

The spelling of 15540344432 in words is "fifteen billion, five hundred forty million, three hundred forty-four thousand, four hundred thirty-two".