55538643 has 8 divisors (see below), whose sum is σ = 78407568. Its totient is φ = 34847744.

The previous prime is 55538633. The next prime is 55538657. The reversal of 55538643 is 34683555.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55538643 - 2⁴ = 55538627 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55538603) 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 7 ways as a sum of consecutive naturals, for example, 544446 + ... + 544547.

It is an arithmetic number, because the mean of its divisors is an integer number (9800946).

Almost surely, 2^55538643 is an apocalyptic number.

55538643 is a deficient number, since it is larger than the sum of its proper divisors (22868925).

55538643 is a wasteful number, since it uses less digits than its factorization.

55538643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1089013.

The product of its digits is 216000, while the sum is 39.

The square root of 55538643 is about 7452.4253099243. The cubic root of 55538643 is about 381.5326901682.

It can be divided in two parts, 5553 and 8643, that added together give a triangular number (14196 = T₁₆₈).

The spelling of 55538643 in words is "fifty-five million, five hundred thirty-eight thousand, six hundred forty-three".