208185145057 has 4 divisors (see below), whose sum is σ = 211292386096. Its totient is φ = 205077904020.

The previous prime is 208185145039. The next prime is 208185145087. The reversal of 208185145057 is 750541581802.

208185145057 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 750541581802 = 2 ⋅375270790901.

It is a cyclic number.

It is not a de Polignac number, because 208185145057 - 2¹¹ = 208185143009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 208185144998 and 208185145016.

It is not an unprimeable number, because it can be changed into a prime (208185145087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1553620419 + ... + 1553620552.

It is an arithmetic number, because the mean of its divisors is an integer number (52823096524).

Almost surely, 2^208185145057 is an apocalyptic number.

It is an amenable number.

208185145057 is a deficient number, since it is larger than the sum of its proper divisors (3107241039).

208185145057 is an equidigital number, since it uses as much as digits as its factorization.

208185145057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3107241038.

The product of its (nonzero) digits is 448000, while the sum is 46.

The spelling of 208185145057 in words is "two hundred eight billion, one hundred eighty-five million, one hundred forty-five thousand, fifty-seven".