217972169036 has 6 divisors (see below), whose sum is σ = 381451295820. Its totient is φ = 108986084516.

The previous prime is 217972169033. The next prime is 217972169059. The reversal of 217972169036 is 630961279712.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27246521126 + ... + 27246521133.

It is an arithmetic number, because the mean of its divisors is an integer number (63575215970).

Almost surely, 2^217972169036 is an apocalyptic number.

It is an amenable number.

217972169036 is a deficient number, since it is larger than the sum of its proper divisors (163479126784).

217972169036 is a wasteful number, since it uses less digits than its factorization.

217972169036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54493042263 (or 54493042261 counting only the distinct ones).

The product of its (nonzero) digits is 1714608, while the sum is 53.

The spelling of 217972169036 in words is "two hundred seventeen billion, nine hundred seventy-two million, one hundred sixty-nine thousand, thirty-six".