15521162440 has 32 divisors (see below), whose sum is σ = 39911561280. Its totient is φ = 5321541312.

The previous prime is 15521162411. The next prime is 15521162443. The reversal of 15521162440 is 4426112551.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (15521162443) 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, 27716082 + ... + 27716641.

It is an arithmetic number, because the mean of its divisors is an integer number (1247236290).

Almost surely, 2^15521162440 is an apocalyptic number.

15521162440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15521162440 is an abundant number, since it is smaller than the sum of its proper divisors (24390398840).

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

15521162440 is a wasteful number, since it uses less digits than its factorization.

15521162440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55432741 (or 55432737 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 31.

Adding to 15521162440 its reverse (4426112551), we get a palindrome (19947274991).

The spelling of 15521162440 in words is "fifteen billion, five hundred twenty-one million, one hundred sixty-two thousand, four hundred forty".