217565315340 has 24 divisors (see below), whose sum is σ = 609182883120. Its totient is φ = 58017417408.

The previous prime is 217565315269. The next prime is 217565315389. The reversal of 217565315340 is 43513565712.

It is a junction number, because it is equal to n+sod(n) for n = 217565315292 and 217565315301.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1813044235 + ... + 1813044354.

It is an arithmetic number, because the mean of its divisors is an integer number (25382620130).

Almost surely, 2^217565315340 is an apocalyptic number.

217565315340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

217565315340 is an abundant number, since it is smaller than the sum of its proper divisors (391617567780).

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

217565315340 is a wasteful number, since it uses less digits than its factorization.

217565315340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3626088601 (or 3626088599 counting only the distinct ones).

The product of its (nonzero) digits is 378000, while the sum is 42.

The spelling of 217565315340 in words is "two hundred seventeen billion, five hundred sixty-five million, three hundred fifteen thousand, three hundred forty".