15520061340 has 288 divisors, whose sum is σ = 56309600256. Its totient is φ = 3385359360.

The previous prime is 15520061339. The next prime is 15520061363. The reversal of 15520061340 is 4316002551.

15520061340 is a `hidden beast` number, since 1 + 5 + 5 + 2 + 0 + 0 + 613 + 40 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2848659 + ... + 2854101.

Almost surely, 2^15520061340 is an apocalyptic number.

15520061340 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 15520061340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28154800128).

15520061340 is an abundant number, since it is smaller than the sum of its proper divisors (40789538916).

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

15520061340 is a wasteful number, since it uses less digits than its factorization.

15520061340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5569 (or 5564 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

Adding to 15520061340 its reverse (4316002551), we get a palindrome (19836063891).

The spelling of 15520061340 in words is "fifteen billion, five hundred twenty million, sixty-one thousand, three hundred forty".