15540140044 has 48 divisors (see below), whose sum is σ = 32110444800. Its totient is φ = 6487525440.

The previous prime is 15540140041. The next prime is 15540140053. The reversal of 15540140044 is 44004104551.

It is a junction number, because it is equal to n+sod(n) for n = 15540139994 and 15540140021.

It is not an unprimeable number, because it can be changed into a prime (15540140041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45567 + ... + 182089.

It is an arithmetic number, because the mean of its divisors is an integer number (668967600).

Almost surely, 2^15540140044 is an apocalyptic number.

It is an amenable number.

15540140044 is an abundant number, since it is smaller than the sum of its proper divisors (16570304756).

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

15540140044 is a wasteful number, since it uses less digits than its factorization.

15540140044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136750 (or 136748 counting only the distinct ones).

The product of its (nonzero) digits is 6400, while the sum is 28.

Adding to 15540140044 its reverse (44004104551), we get a palindrome (59544244595).

The spelling of 15540140044 in words is "fifteen billion, five hundred forty million, one hundred forty thousand, forty-four".