52111215540 has 240 divisors, whose sum is σ = 173346288192. Its totient is φ = 13059615744.

The previous prime is 52111215521. The next prime is 52111215613. The reversal of 52111215540 is 4551211125.

It is a happy number.

52111215540 is a `hidden beast` number, since 5 + 2 + 1 + 112 + 1 + 5 + 540 = 666.

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

It is a congruent number.

It is an unprimeable number.

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 79 ways as a sum of consecutive naturals, for example, 32028207 + ... + 32029833.

Almost surely, 2^52111215540 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 52111215540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86673144096).

52111215540 is an abundant number, since it is smaller than the sum of its proper divisors (121235072652).

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

52111215540 is a wasteful number, since it uses less digits than its factorization.

52111215540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2828 (or 2817 counting only the distinct ones).

The product of its (nonzero) digits is 2000, while the sum is 27.

Adding to 52111215540 its reverse (4551211125), we get a palindrome (56662426665).

The spelling of 52111215540 in words is "fifty-two billion, one hundred eleven million, two hundred fifteen thousand, five hundred forty".