217952050545 has 48 divisors (see below), whose sum is σ = 397725082560. Its totient is φ = 110107029888.

The previous prime is 217952050543. The next prime is 217952050549. The reversal of 217952050545 is 545050259712.

217952050545 is a `hidden beast` number, since 2 + 1 + 7 + 9 + 52 + 0 + 50 + 545 = 666.

It is not a de Polignac number, because 217952050545 - 2¹ = 217952050543 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 217952050545.

It is not an unprimeable number, because it can be changed into a prime (217952050543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7691974 + ... + 7720256.

It is an arithmetic number, because the mean of its divisors is an integer number (8285939220).

Almost surely, 2^217952050545 is an apocalyptic number.

It is an amenable number.

217952050545 is a deficient number, since it is larger than the sum of its proper divisors (179773032015).

217952050545 is a wasteful number, since it uses less digits than its factorization.

217952050545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37326 (or 37323 counting only the distinct ones).

The product of its (nonzero) digits is 630000, while the sum is 45.

The spelling of 217952050545 in words is "two hundred seventeen billion, nine hundred fifty-two million, fifty thousand, five hundred forty-five".