166552315609 has 2 divisors, whose sum is σ = 166552315610. Its totient is φ = 166552315608.

The previous prime is 166552315519. The next prime is 166552315649. The reversal of 166552315609 is 906513255661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 164754810000 + 1797505609 = 405900^2 + 42397^2 .

It is a cyclic number.

It is not a de Polignac number, because 166552315609 - 2¹¹ = 166552313561 is a prime.

It is not a weakly prime, because it can be changed into another prime (166552315649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83276157804 + 83276157805.

It is an arithmetic number, because the mean of its divisors is an integer number (83276157805).

Almost surely, 2^166552315609 is an apocalyptic number.

It is an amenable number.

166552315609 is a deficient number, since it is larger than the sum of its proper divisors (1).

166552315609 is an equidigital number, since it uses as much as digits as its factorization.

166552315609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1458000, while the sum is 49.

The spelling of 166552315609 in words is "one hundred sixty-six billion, five hundred fifty-two million, three hundred fifteen thousand, six hundred nine".