15540207480 has 256 divisors, whose sum is σ = 59727974400. Its totient is φ = 3520419840.

The previous prime is 15540207461. The next prime is 15540207481. The reversal of 15540207480 is 8470204551.

15540207480 is a `hidden beast` number, since 1 + 554 + 0 + 20 + 7 + 4 + 80 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15540207481) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 845185 + ... + 863375.

It is an arithmetic number, because the mean of its divisors is an integer number (233312400).

Almost surely, 2^15540207480 is an apocalyptic number.

15540207480 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 15540207480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29863987200).

15540207480 is an abundant number, since it is smaller than the sum of its proper divisors (44187766920).

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

15540207480 is a wasteful number, since it uses less digits than its factorization.

15540207480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18331 (or 18321 counting only the distinct ones).

The product of its (nonzero) digits is 44800, while the sum is 36.

The spelling of 15540207480 in words is "fifteen billion, five hundred forty million, two hundred seven thousand, four hundred eighty".