215644162340640 has 576 divisors, whose sum is σ = 791638422906240. Its totient is φ = 49135487385600.

The previous prime is 215644162340599. The next prime is 215644162340683. The reversal of 215644162340640 is 46043261446512.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 215644162340640.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 729511270 + ... + 729806810.

It is an arithmetic number, because the mean of its divisors is an integer number (1374372261990).

Almost surely, 2^{215644162340640} is an apocalyptic number.

215644162340640 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 215644162340640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (395819211453120).

215644162340640 is an abundant number, since it is smaller than the sum of its proper divisors (575994260565600).

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

215644162340640 is a wasteful number, since it uses less digits than its factorization.

215644162340640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 296337 (or 296318 counting only the distinct ones).

The product of its (nonzero) digits is 3317760, while the sum is 48.

The spelling of 215644162340640 in words is "two hundred fifteen trillion, six hundred forty-four billion, one hundred sixty-two million, three hundred forty thousand, six hundred forty".