15561802480 has 80 divisors (see below), whose sum is σ = 41497504704. Its totient is φ = 5316433920.

The previous prime is 15561802453. The next prime is 15561802481. The reversal of 15561802480 is 8420816551.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15561802481) 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, 107914 + ... + 206806.

Almost surely, 2^15561802480 is an apocalyptic number.

15561802480 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15561802480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20748752352).

15561802480 is an abundant number, since it is smaller than the sum of its proper divisors (25935702224).

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

15561802480 is a wasteful number, since it uses less digits than its factorization.

15561802480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99194 (or 99188 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 40.

The spelling of 15561802480 in words is "fifteen billion, five hundred sixty-one million, eight hundred two thousand, four hundred eighty".