55216566025 has 6 divisors (see below), whose sum is σ = 68468541902. Its totient is φ = 44173252800.

The previous prime is 55216565983. The next prime is 55216566029. The reversal of 55216566025 is 52066561255.

It can be written as a sum of positive squares in 3 ways, for example, as 4909664761 + 50306901264 = 70069^2 + 224292^2 .

It is not a de Polignac number, because 55216566025 - 2¹⁵ = 55216533257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55216566029) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1104331296 + ... + 1104331345.

Almost surely, 2^55216566025 is an apocalyptic number.

It is an amenable number.

55216566025 is a deficient number, since it is larger than the sum of its proper divisors (13251975877).

55216566025 is a wasteful number, since it uses less digits than its factorization.

55216566025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2208662651 (or 2208662646 counting only the distinct ones).

The product of its (nonzero) digits is 540000, while the sum is 43.

The spelling of 55216566025 in words is "fifty-five billion, two hundred sixteen million, five hundred sixty-six thousand, twenty-five".