2156501305530 has 192 divisors, whose sum is σ = 6615411409152. Its totient is φ = 480501918720.

The previous prime is 2156501305501. The next prime is 2156501305549. The reversal of 2156501305530 is 355031056512.

2156501305530 is a `hidden beast` number, since 2 + 1 + 56 + 50 + 1 + 3 + 0 + 553 + 0 = 666.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2639139 + ... + 3358281.

It is an arithmetic number, because the mean of its divisors is an integer number (34455267756).

Almost surely, 2^{2156501305530} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2156501305530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3307705704576).

2156501305530 is an abundant number, since it is smaller than the sum of its proper divisors (4458910103622).

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

2156501305530 is a wasteful number, since it uses less digits than its factorization.

2156501305530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 719413 (or 719410 counting only the distinct ones).

The product of its (nonzero) digits is 67500, while the sum is 36.

The spelling of 2156501305530 in words is "two trillion, one hundred fifty-six billion, five hundred one million, three hundred five thousand, five hundred thirty".