217963330953 has 24 divisors (see below), whose sum is σ = 311901321312. Its totient is φ = 135351343104.

The previous prime is 217963330943. The next prime is 217963330973. The reversal of 217963330953 is 359033369712.

It is a happy number.

It is not a de Polignac number, because 217963330953 - 2⁶ = 217963330889 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a junction number, because it is equal to n+sod(n) for n = 217963330896 and 217963330905.

It is not an unprimeable number, because it can be changed into a prime (217963330943) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1211775 + ... + 1379972.

It is an arithmetic number, because the mean of its divisors is an integer number (12995888388).

Almost surely, 2^217963330953 is an apocalyptic number.

It is an amenable number.

217963330953 is a deficient number, since it is larger than the sum of its proper divisors (93937990359).

217963330953 is a wasteful number, since it uses less digits than its factorization.

217963330953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2591881 (or 2591864 counting only the distinct ones).

The product of its (nonzero) digits is 2755620, while the sum is 51.

The spelling of 217963330953 in words is "two hundred seventeen billion, nine hundred sixty-three million, three hundred thirty thousand, nine hundred fifty-three".