15540880320 has 784 divisors, whose sum is σ = 65669818368. Its totient is φ = 3426416640.

The previous prime is 15540880253. The next prime is 15540880339. The reversal of 15540880320 is 2308804551.

It is a happy number.

15540880320 is a `hidden beast` number, since 1 + 5 + 540 + 8 + 80 + 32 + 0 = 666.

It is a super-2 number, since 2×15540880320² (a number of 21 digits) contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 50621607 + ... + 50621913.

Almost surely, 2^15540880320 is an apocalyptic number.

15540880320 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 15540880320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32834909184).

15540880320 is an abundant number, since it is smaller than the sum of its proper divisors (50128938048).

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

15540880320 is an equidigital number, since it uses as much as digits as its factorization.

15540880320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380 (or 355 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 36.

The spelling of 15540880320 in words is "fifteen billion, five hundred forty million, eight hundred eighty thousand, three hundred twenty".