217073661 has 8 divisors (see below), whose sum is σ = 330778944. Its totient is φ = 124042080.

The previous prime is 217073641. The next prime is 217073669. The reversal of 217073661 is 166370712.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 217073661 - 2⁷ = 217073533 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217073669) 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 7 ways as a sum of consecutive naturals, for example, 5168400 + ... + 5168441.

It is an arithmetic number, because the mean of its divisors is an integer number (41347368).

Almost surely, 2^217073661 is an apocalyptic number.

217073661 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

217073661 is a deficient number, since it is larger than the sum of its proper divisors (113705283).

217073661 is a wasteful number, since it uses less digits than its factorization.

217073661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10336851.

The product of its (nonzero) digits is 10584, while the sum is 33.

The square root of 217073661 is about 14733.4198677700. The cubic root of 217073661 is about 600.9924879299.

The spelling of 217073661 in words is "two hundred seventeen million, seventy-three thousand, six hundred sixty-one".