166561429 has 12 divisors (see below), whose sum is σ = 176357280. Its totient is φ = 157285800.

The previous prime is 166561411. The next prime is 166561433. The reversal of 166561429 is 924165661.

It is a happy number.

It is not a de Polignac number, because 166561429 - 2⁷ = 166561301 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 166561391 and 166561400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166565429) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 157954 + ... + 159004.

It is an arithmetic number, because the mean of its divisors is an integer number (14696440).

Almost surely, 2^166561429 is an apocalyptic number.

166561429 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

166561429 is a deficient number, since it is larger than the sum of its proper divisors (9795851).

166561429 is a wasteful number, since it uses less digits than its factorization.

166561429 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1528 (or 1509 counting only the distinct ones).

The product of its digits is 77760, while the sum is 40.

The square root of 166561429 is about 12905.8680064535. The cubic root of 166561429 is about 550.2053547217.

The spelling of 166561429 in words is "one hundred sixty-six million, five hundred sixty-one thousand, four hundred twenty-nine".