55557993 has 8 divisors (see below), whose sum is σ = 75884256. Its totient is φ = 36135200.

The previous prime is 55557967. The next prime is 55558001. The reversal of 55557993 is 39975555.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55557993 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (55557923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 225723 + ... + 225968.

It is an arithmetic number, because the mean of its divisors is an integer number (9485532).

Almost surely, 2^55557993 is an apocalyptic number.

It is an amenable number.

55557993 is a deficient number, since it is larger than the sum of its proper divisors (20326263).

55557993 is a wasteful number, since it uses less digits than its factorization.

55557993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451735.

The product of its digits is 1063125, while the sum is 48.

The square root of 55557993 is about 7453.7234319500. The cubic root of 55557993 is about 381.5769944576.

The spelling of 55557993 in words is "fifty-five million, five hundred fifty-seven thousand, nine hundred ninety-three".