55129663 has 4 divisors (see below), whose sum is σ = 55205608. Its totient is φ = 55053720.

The previous prime is 55129631. The next prime is 55129681. The reversal of 55129663 is 36692155.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36692155 = 5 ⋅7338431.

It is a cyclic number.

It is not a de Polignac number, because 55129663 - 2⁵ = 55129631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55129603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36873 + ... + 38338.

It is an arithmetic number, because the mean of its divisors is an integer number (13801402).

Almost surely, 2^55129663 is an apocalyptic number.

55129663 is a deficient number, since it is larger than the sum of its proper divisors (75945).

55129663 is an equidigital number, since it uses as much as digits as its factorization.

55129663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75944.

The product of its digits is 48600, while the sum is 37.

The square root of 55129663 is about 7424.9352185726. The cubic root of 55129663 is about 380.5938613695.

The spelling of 55129663 in words is "fifty-five million, one hundred twenty-nine thousand, six hundred sixty-three".