55216533257 has 2 divisors, whose sum is σ = 55216533258. Its totient is φ = 55216533256.

The previous prime is 55216533247. The next prime is 55216533263. The reversal of 55216533257 is 75233561255.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40268047561 + 14948485696 = 200669^2 + 122264^2 .

It is a cyclic number.

It is not a de Polignac number, because 55216533257 - 2¹² = 55216529161 is a prime.

It is a super-4 number, since 4×55216533257⁴ (a number of 44 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (55216533217) 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 as a sum of consecutive naturals, namely, 27608266628 + 27608266629.

It is an arithmetic number, because the mean of its divisors is an integer number (27608266629).

Almost surely, 2^55216533257 is an apocalyptic number.

It is an amenable number.

55216533257 is a deficient number, since it is larger than the sum of its proper divisors (1).

55216533257 is an equidigital number, since it uses as much as digits as its factorization.

55216533257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 945000, while the sum is 44.

The spelling of 55216533257 in words is "fifty-five billion, two hundred sixteen million, five hundred thirty-three thousand, two hundred fifty-seven".