215443610965440 has 1344 divisors, whose sum is σ = 923830192276992. Its totient is φ = 47089863475200.

The previous prime is 215443610965367. The next prime is 215443610965459. The reversal of 215443610965440 is 44569016344512.

215443610965440 is a `hidden beast` number, since 2 + 1 + 5 + 4 + 4 + 3 + 6 + 1 + 0 + 96 + 544 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 477920950 + ... + 478371530.

It is an arithmetic number, because the mean of its divisors is an integer number (687373654968).

Almost surely, 2^{215443610965440} is an apocalyptic number.

215443610965440 is a gapful number since it is divisible by the number (20) 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 215443610965440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (461915096138496).

215443610965440 is an abundant number, since it is smaller than the sum of its proper divisors (708386581311552).

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

215443610965440 is a wasteful number, since it uses less digits than its factorization.

215443610965440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450680 (or 450658 counting only the distinct ones).

The product of its (nonzero) digits is 12441600, while the sum is 54.

The spelling of 215443610965440 in words is "two hundred fifteen trillion, four hundred forty-three billion, six hundred ten million, nine hundred sixty-five thousand, four hundred forty".