217972169037 has 144 divisors (see below), whose sum is σ = 393751987200. Its totient is φ = 115500893760.

The previous prime is 217972169033. The next prime is 217972169059. The reversal of 217972169037 is 730961279712.

It is not a de Polignac number, because 217972169037 - 2² = 217972169033 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217972169033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 133971018 + ... + 133972644.

It is an arithmetic number, because the mean of its divisors is an integer number (2734388800).

Almost surely, 2^217972169037 is an apocalyptic number.

It is an amenable number.

217972169037 is a deficient number, since it is larger than the sum of its proper divisors (175779818163).

217972169037 is a wasteful number, since it uses less digits than its factorization.

217972169037 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1996 (or 1986 counting only the distinct ones).

The product of its (nonzero) digits is 2000376, while the sum is 54.

The spelling of 217972169037 in words is "two hundred seventeen billion, nine hundred seventy-two million, one hundred sixty-nine thousand, thirty-seven".