215123133456 has 720 divisors, whose sum is σ = 805785926400. Its totient is φ = 52442818560.

The previous prime is 215123133409. The next prime is 215123133457. The reversal of 215123133456 is 654331321512.

215123133456 is a `hidden beast` number, since 2 + 1 + 51 + 23 + 133 + 456 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 215123133456.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215123133457) 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 143 ways as a sum of consecutive naturals, for example, 599228605 + ... + 599228963.

It is an arithmetic number, because the mean of its divisors is an integer number (1119147120).

Almost surely, 2^215123133456 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 215123133456, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (402892963200).

215123133456 is an abundant number, since it is smaller than the sum of its proper divisors (590662792944).

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

215123133456 is a wasteful number, since it uses less digits than its factorization.

215123133456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 453 (or 399 counting only the distinct ones).

The product of its digits is 64800, while the sum is 36.

Adding to 215123133456 its reverse (654331321512), we get a palindrome (869454454968).

The spelling of 215123133456 in words is "two hundred fifteen billion, one hundred twenty-three million, one hundred thirty-three thousand, four hundred fifty-six".