55516631 has 4 divisors (see below), whose sum is σ = 55532064. Its totient is φ = 55501200.

The previous prime is 55516627. The next prime is 55516639. The reversal of 55516631 is 13661555.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 13661555 = 5 ⋅2732311.

It is a cyclic number.

It is not a de Polignac number, because 55516631 - 2² = 55516627 is a prime.

It is a super-2 number, since 2×55516631² = 6164192635180322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55516639) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 851 + ... + 10571.

It is an arithmetic number, because the mean of its divisors is an integer number (13883016).

Almost surely, 2^55516631 is an apocalyptic number.

55516631 is a deficient number, since it is larger than the sum of its proper divisors (15433).

55516631 is an equidigital number, since it uses as much as digits as its factorization.

55516631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15432.

The product of its digits is 13500, while the sum is 32.

The square root of 55516631 is about 7450.9483289042. The cubic root of 55516631 is about 381.4822783775.

The spelling of 55516631 in words is "fifty-five million, five hundred sixteen thousand, six hundred thirty-one".