217414372861 has 4 divisors (see below), whose sum is σ = 248473568992. Its totient is φ = 186355176732.

The previous prime is 217414372841. The next prime is 217414372871. The reversal of 217414372861 is 168273414712.

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 217414372861 - 2⁵ = 217414372829 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 (217414372841) 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, 15529598055 + ... + 15529598068.

It is an arithmetic number, because the mean of its divisors is an integer number (62118392248).

Almost surely, 2^217414372861 is an apocalyptic number.

It is an amenable number.

217414372861 is a deficient number, since it is larger than the sum of its proper divisors (31059196131).

217414372861 is an equidigital number, since it uses as much as digits as its factorization.

217414372861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31059196130.

The product of its digits is 451584, while the sum is 46.

The spelling of 217414372861 in words is "two hundred seventeen billion, four hundred fourteen million, three hundred seventy-two thousand, eight hundred sixty-one".