215366321064 has 16 divisors (see below), whose sum is σ = 538415802720. Its totient is φ = 71788773680.

The previous prime is 215366321041. The next prime is 215366321081. The reversal of 215366321064 is 460123663512.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4486798332 + ... + 4486798379.

It is an arithmetic number, because the mean of its divisors is an integer number (33650987670).

Almost surely, 2^215366321064 is an apocalyptic number.

215366321064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

215366321064 is an abundant number, since it is smaller than the sum of its proper divisors (323049481656).

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

215366321064 is a wasteful number, since it uses less digits than its factorization.

215366321064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8973596720 (or 8973596716 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 39.

Adding to 215366321064 its reverse (460123663512), we get a palindrome (675489984576).

The spelling of 215366321064 in words is "two hundred fifteen billion, three hundred sixty-six million, three hundred twenty-one thousand, sixty-four".