55406657 has 2 divisors, whose sum is σ = 55406658. Its totient is φ = 55406656.

The previous prime is 55406639. The next prime is 55406669. The reversal of 55406657 is 75660455.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40653376 + 14753281 = 6376^2 + 3841^2 .

It is a cyclic number.

It is not a de Polignac number, because 55406657 - 2¹⁰ = 55405633 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55406657.

It is not a weakly prime, because it can be changed into another prime (55406257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27703328 + 27703329.

It is an arithmetic number, because the mean of its divisors is an integer number (27703329).

Almost surely, 2^55406657 is an apocalyptic number.

It is an amenable number.

55406657 is a deficient number, since it is larger than the sum of its proper divisors (1).

55406657 is an equidigital number, since it uses as much as digits as its factorization.

55406657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 126000, while the sum is 38.

The square root of 55406657 is about 7443.5648045812. The cubic root of 55406657 is about 381.2302165852.

The spelling of 55406657 in words is "fifty-five million, four hundred six thousand, six hundred fifty-seven".