15545040240 has 40 divisors (see below), whose sum is σ = 48189625488. Its totient is φ = 4145344000.

The previous prime is 15545040229. The next prime is 15545040299. The reversal of 15545040240 is 4204054551.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 15545040198 and 15545040207.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32385261 + ... + 32385740.

Almost surely, 2^15545040240 is an apocalyptic number.

15545040240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15545040240 is an abundant number, since it is smaller than the sum of its proper divisors (32644585248).

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

15545040240 is a wasteful number, since it uses less digits than its factorization.

15545040240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64771017 (or 64771011 counting only the distinct ones).

The product of its (nonzero) digits is 16000, while the sum is 30.

Adding to 15545040240 its reverse (4204054551), we get a palindrome (19749094791).

The spelling of 15545040240 in words is "fifteen billion, five hundred forty-five million, forty thousand, two hundred forty".