2155285956564 has 288 divisors, whose sum is σ = 6331785707520. Its totient is φ = 612965193984.

The previous prime is 2155285956559. The next prime is 2155285956623. The reversal of 2155285956564 is 4656595825512.

It is a happy number.

2155285956564 is a `hidden beast` number, since 2 + 1 + 5 + 5 + 2 + 8 + 5 + 9 + 565 + 64 = 666.

It is a congruent 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, 39939769 + ... + 39993695.

It is an arithmetic number, because the mean of its divisors is an integer number (21985367040).

Almost surely, 2^{2155285956564} 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 2155285956564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3165892853760).

2155285956564 is an abundant number, since it is smaller than the sum of its proper divisors (4176499750956).

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

2155285956564 is a wasteful number, since it uses less digits than its factorization.

2155285956564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54099 (or 54094 counting only the distinct ones).

The product of its digits is 129600000, while the sum is 63.

The spelling of 2155285956564 in words is "two trillion, one hundred fifty-five billion, two hundred eighty-five million, nine hundred fifty-six thousand, five hundred sixty-four".