55561138 has 8 divisors (see below), whose sum is σ = 83480832. Its totient is φ = 27734196.

The previous prime is 55561043. The next prime is 55561139. The reversal of 55561138 is 83116555.

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

It is not an unprimeable number, because it can be changed into a prime (55561139) 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, 21670 + ... + 24097.

It is an arithmetic number, because the mean of its divisors is an integer number (10435104).

Almost surely, 2^55561138 is an apocalyptic number.

55561138 is a deficient number, since it is larger than the sum of its proper divisors (27919694).

55561138 is a wasteful number, since it uses less digits than its factorization.

55561138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46376.

The product of its digits is 18000, while the sum is 34.

The square root of 55561138 is about 7453.9343973502. The cubic root of 55561138 is about 381.5841943637.

The spelling of 55561138 in words is "fifty-five million, five hundred sixty-one thousand, one hundred thirty-eight".