55557907 has 2 divisors, whose sum is σ = 55557908. Its totient is φ = 55557906.

The previous prime is 55557899. The next prime is 55557917. The reversal of 55557907 is 70975555.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55557907 - 2³ = 55557899 is a prime.

It is not a weakly prime, because it can be changed into another prime (55557917) 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, 27778953 + 27778954.

It is an arithmetic number, because the mean of its divisors is an integer number (27778954).

Almost surely, 2^55557907 is an apocalyptic number.

55557907 is a deficient number, since it is larger than the sum of its proper divisors (1).

55557907 is an equidigital number, since it uses as much as digits as its factorization.

55557907 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 275625, while the sum is 43.

The square root of 55557907 is about 7453.7176630189. The cubic root of 55557907 is about 381.5767975724.

The spelling of 55557907 in words is "fifty-five million, five hundred fifty-seven thousand, nine hundred seven".