55016717421 has 4 divisors (see below), whose sum is σ = 73355623232. Its totient is φ = 36677811612.

The previous prime is 55016717417. The next prime is 55016717453. The reversal of 55016717421 is 12471761055.

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 not a de Polignac number, because 55016717421 - 2² = 55016717417 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55016717421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55016715421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9169452901 + ... + 9169452906.

It is an arithmetic number, because the mean of its divisors is an integer number (18338905808).

Almost surely, 2^55016717421 is an apocalyptic number.

It is an amenable number.

55016717421 is a deficient number, since it is larger than the sum of its proper divisors (18338905811).

55016717421 is a wasteful number, since it uses less digits than its factorization.

55016717421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18338905810.

The product of its (nonzero) digits is 58800, while the sum is 39.

The spelling of 55016717421 in words is "fifty-five billion, sixteen million, seven hundred seventeen thousand, four hundred twenty-one".