55578771901 has 2 divisors, whose sum is σ = 55578771902. Its totient is φ = 55578771900.

The previous prime is 55578771883. The next prime is 55578771947. The reversal of 55578771901 is 10917787555.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28789266276 + 26789505625 = 169674^2 + 163675^2 .

It is a cyclic number.

It is not a de Polignac number, because 55578771901 - 2¹⁷ = 55578640829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55578777901) 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, 27789385950 + 27789385951.

It is an arithmetic number, because the mean of its divisors is an integer number (27789385951).

Almost surely, 2^55578771901 is an apocalyptic number.

It is an amenable number.

55578771901 is a deficient number, since it is larger than the sum of its proper divisors (1).

55578771901 is an equidigital number, since it uses as much as digits as its factorization.

55578771901 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3087000, while the sum is 55.

The spelling of 55578771901 in words is "fifty-five billion, five hundred seventy-eight million, seven hundred seventy-one thousand, nine hundred one".