2015540064 has 192 divisors, whose sum is σ = 6295968000. Its totient is φ = 625397760.

The previous prime is 2015540063. The next prime is 2015540081. The reversal of 2015540064 is 4600455102.

2015540064 is a `hidden beast` number, since 201 + 55 + 400 + 6 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2015540063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 967504 + ... + 969584.

It is an arithmetic number, because the mean of its divisors is an integer number (32791500).

Almost surely, 2^2015540064 is an apocalyptic number.

2015540064 is a gapful number since it is divisible by the number (24) 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 2015540064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3147984000).

2015540064 is an abundant number, since it is smaller than the sum of its proper divisors (4280427936).

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

2015540064 is a wasteful number, since it uses less digits than its factorization.

2015540064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2178 (or 2164 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

The square root of 2015540064 is about 44894.7665546888. The cubic root of 2015540064 is about 1263.1758434029.

Adding to 2015540064 its reverse (4600455102), we get a palindrome (6615995166).

The spelling of 2015540064 in words is "two billion, fifteen million, five hundred forty thousand, sixty-four".