156505665061 has 2 divisors, whose sum is σ = 156505665062. Its totient is φ = 156505665060.

The previous prime is 156505665053. The next prime is 156505665067. The reversal of 156505665061 is 160566505651.

156505665061 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 140722516900 + 15783148161 = 375130^2 + 125631^2 .

It is an emirp because it is prime and its reverse (160566505651) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 156505665061 - 2³ = 156505665053 is a prime.

It is a super-2 number, since 2×156505665061² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (156505665067) 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, 78252832530 + 78252832531.

It is an arithmetic number, because the mean of its divisors is an integer number (78252832531).

Almost surely, 2^156505665061 is an apocalyptic number.

It is an amenable number.

156505665061 is a deficient number, since it is larger than the sum of its proper divisors (1).

156505665061 is an equidigital number, since it uses as much as digits as its factorization.

156505665061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 810000, while the sum is 46.

The spelling of 156505665061 in words is "one hundred fifty-six billion, five hundred five million, six hundred sixty-five thousand, sixty-one".