55216290818 has 16 divisors (see below), whose sum is σ = 90197747640. Its totient is φ = 25198098816.

The previous prime is 55216290799. The next prime is 55216290821. The reversal of 55216290818 is 81809261255.

It can be written as a sum of positive squares in 4 ways, for example, as 41021236369 + 14195054449 = 202537^2 + 119143^2 .

It is a super-2 number, since 2×55216290818² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11928605 + ... + 11933232.

Almost surely, 2^55216290818 is an apocalyptic number.

55216290818 is a deficient number, since it is larger than the sum of its proper divisors (34981456822).

55216290818 is a wasteful number, since it uses less digits than its factorization.

55216290818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23861941.

The product of its (nonzero) digits is 345600, while the sum is 47.

The spelling of 55216290818 in words is "fifty-five billion, two hundred sixteen million, two hundred ninety thousand, eight hundred eighteen".