55557427 has 2 divisors, whose sum is σ = 55557428. Its totient is φ = 55557426.

The previous prime is 55557421. The next prime is 55557499. The reversal of 55557427 is 72475555.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55557427 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55557427.

It is not a weakly prime, because it can be changed into another prime (55557421) 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 as a sum of consecutive naturals, namely, 27778713 + 27778714.

It is an arithmetic number, because the mean of its divisors is an integer number (27778714).

Almost surely, 2^55557427 is an apocalyptic number.

55557427 is a deficient number, since it is larger than the sum of its proper divisors (1).

55557427 is an equidigital number, since it uses as much as digits as its factorization.

55557427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 245000, while the sum is 40.

The square root of 55557427 is about 7453.6854642519. The cubic root of 55557427 is about 381.5756986746.

The spelling of 55557427 in words is "fifty-five million, five hundred fifty-seven thousand, four hundred twenty-seven".