156666952069 has 2 divisors, whose sum is σ = 156666952070. Its totient is φ = 156666952068.

The previous prime is 156666952021. The next prime is 156666952073. The reversal of 156666952069 is 960259666651.

It is a happy number.

156666952069 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., 125006087844 + 31660864225 = 353562^2 + 177935^2 .

It is an emirp because it is prime and its reverse (960259666651) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 156666952069 - 2³¹ = 154519468421 is a prime.

It is a super-2 number, since 2×156666952069² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 156666951998 and 156666952016.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (156666952669) 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, 78333476034 + 78333476035.

It is an arithmetic number, because the mean of its divisors is an integer number (78333476035).

Almost surely, 2^156666952069 is an apocalyptic number.

It is an amenable number.

156666952069 is a deficient number, since it is larger than the sum of its proper divisors (1).

156666952069 is an equidigital number, since it uses as much as digits as its factorization.

156666952069 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31492800, while the sum is 61.

The spelling of 156666952069 in words is "one hundred fifty-six billion, six hundred sixty-six million, nine hundred fifty-two thousand, sixty-nine".