217153581893 has 2 divisors, whose sum is σ = 217153581894. Its totient is φ = 217153581892.

The previous prime is 217153581871. The next prime is 217153581901. The reversal of 217153581893 is 398185351712.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 210921584644 + 6231997249 = 459262^2 + 78943^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-217153581893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (217153581833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108576790946 + 108576790947.

It is an arithmetic number, because the mean of its divisors is an integer number (108576790947).

Almost surely, 2^217153581893 is an apocalyptic number.

It is an amenable number.

217153581893 is a deficient number, since it is larger than the sum of its proper divisors (1).

217153581893 is an equidigital number, since it uses as much as digits as its factorization.

217153581893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1814400, while the sum is 53.

The spelling of 217153581893 in words is "two hundred seventeen billion, one hundred fifty-three million, five hundred eighty-one thousand, eight hundred ninety-three".