217068392464 has 160 divisors (see below), whose sum is σ = 534372940800. Its totient is φ = 82961195520.

The previous prime is 217068392461. The next prime is 217068392591. The reversal of 217068392464 is 464293860712.

It is not an unprimeable number, because it can be changed into a prime (217068392461) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36995259 + ... + 37001125.

It is an arithmetic number, because the mean of its divisors is an integer number (3339830880).

Almost surely, 2^217068392464 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 217068392464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (267186470400).

217068392464 is an abundant number, since it is smaller than the sum of its proper divisors (317304548336).

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

217068392464 is a wasteful number, since it uses less digits than its factorization.

217068392464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6461 (or 6455 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 52.

The spelling of 217068392464 in words is "two hundred seventeen billion, sixty-eight million, three hundred ninety-two thousand, four hundred sixty-four".