55453215217 has 4 divisors (see below), whose sum is σ = 55562161140. Its totient is φ = 55344269296.

The previous prime is 55453215203. The next prime is 55453215269. The reversal of 55453215217 is 71251235455.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 39601398001 + 15851817216 = 199001^2 + 125904^2 .

It is a cyclic number.

It is not a de Polignac number, because 55453215217 - 2¹⁹ = 55452690929 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 55453215217.

It is not an unprimeable number, because it can be changed into a prime (55453215817) 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, 54472198 + ... + 54473215.

It is an arithmetic number, because the mean of its divisors is an integer number (13890540285).

Almost surely, 2^55453215217 is an apocalyptic number.

It is an amenable number.

55453215217 is a deficient number, since it is larger than the sum of its proper divisors (108945923).

55453215217 is a wasteful number, since it uses less digits than its factorization.

55453215217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108945922.

The product of its digits is 210000, while the sum is 40.

The spelling of 55453215217 in words is "fifty-five billion, four hundred fifty-three million, two hundred fifteen thousand, two hundred seventeen".