166505629 has 2 divisors, whose sum is σ = 166505630. Its totient is φ = 166505628.

The previous prime is 166505623. The next prime is 166505639. The reversal of 166505629 is 926505661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 114276100 + 52229529 = 10690^2 + 7227^2 .

It is a cyclic number.

It is not a de Polignac number, because 166505629 - 2²⁷ = 32287901 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 166505591 and 166505600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166505623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83252814 + 83252815.

It is an arithmetic number, because the mean of its divisors is an integer number (83252815).

Almost surely, 2^166505629 is an apocalyptic number.

It is an amenable number.

166505629 is a deficient number, since it is larger than the sum of its proper divisors (1).

166505629 is an equidigital number, since it uses as much as digits as its factorization.

166505629 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 97200, while the sum is 40.

The square root of 166505629 is about 12903.7060180399. The cubic root of 166505629 is about 550.1439061457.

The spelling of 166505629 in words is "one hundred sixty-six million, five hundred five thousand, six hundred twenty-nine".