55215710717 has 4 divisors (see below), whose sum is σ = 55493176800. Its totient is φ = 54938244636.

The previous prime is 55215710699. The next prime is 55215710723. The reversal of 55215710717 is 71701751255.

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 55215710717 - 2¹⁰ = 55215709693 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 (55215710617) 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, 138732743 + ... + 138733140.

It is an arithmetic number, because the mean of its divisors is an integer number (13873294200).

Almost surely, 2^55215710717 is an apocalyptic number.

It is an amenable number.

55215710717 is a deficient number, since it is larger than the sum of its proper divisors (277466083).

55215710717 is a wasteful number, since it uses less digits than its factorization.

55215710717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277466082.

The product of its (nonzero) digits is 85750, while the sum is 41.

The spelling of 55215710717 in words is "fifty-five billion, two hundred fifteen million, seven hundred ten thousand, seven hundred seventeen".