217342954957 has 4 divisors (see below), whose sum is σ = 217441614880. Its totient is φ = 217244295036.

The previous prime is 217342954931. The next prime is 217342954987. The reversal of 217342954957 is 759459243712.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 217342954957 - 2³⁵ = 182983216589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (217342954987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49326657 + ... + 49331062.

It is an arithmetic number, because the mean of its divisors is an integer number (54360403720).

Almost surely, 2^217342954957 is an apocalyptic number.

It is an amenable number.

217342954957 is a deficient number, since it is larger than the sum of its proper divisors (98659923).

217342954957 is an equidigital number, since it uses as much as digits as its factorization.

217342954957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98659922.

The product of its digits is 19051200, while the sum is 58.

The spelling of 217342954957 in words is "two hundred seventeen billion, three hundred forty-two million, nine hundred fifty-four thousand, nine hundred fifty-seven".