155516212057 has 2 divisors, whose sum is σ = 155516212058. Its totient is φ = 155516212056.

The previous prime is 155516212043. The next prime is 155516212073. The reversal of 155516212057 is 750212615551.

155516212057 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 154849333081 + 666878976 = 393509^2 + 25824^2 .

It is a cyclic number.

It is not a de Polignac number, because 155516212057 - 2²⁷ = 155381994329 is a prime.

It is not a weakly prime, because it can be changed into another prime (155516212157) 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 as a sum of consecutive naturals, namely, 77758106028 + 77758106029.

It is an arithmetic number, because the mean of its divisors is an integer number (77758106029).

Almost surely, 2^155516212057 is an apocalyptic number.

It is an amenable number.

155516212057 is a deficient number, since it is larger than the sum of its proper divisors (1).

155516212057 is an equidigital number, since it uses as much as digits as its factorization.

155516212057 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 105000, while the sum is 40.

The spelling of 155516212057 in words is "one hundred fifty-five billion, five hundred sixteen million, two hundred twelve thousand, fifty-seven".