166113641 has 2 divisors, whose sum is σ = 166113642. Its totient is φ = 166113640.

The previous prime is 166113551. The next prime is 166113643. The reversal of 166113641 is 146311661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 96040000 + 70073641 = 9800^2 + 8371^2 .

It is a cyclic number.

It is not a de Polignac number, because 166113641 - 2²² = 161919337 is a prime.

It is a Sophie Germain prime.

Together with 166113643, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (166113643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83056820 + 83056821.

It is an arithmetic number, because the mean of its divisors is an integer number (83056821).

Almost surely, 2^166113641 is an apocalyptic number.

It is an amenable number.

166113641 is a deficient number, since it is larger than the sum of its proper divisors (1).

166113641 is an equidigital number, since it uses as much as digits as its factorization.

166113641 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 29.

The square root of 166113641 is about 12888.5080983021. The cubic root of 166113641 is about 549.7118501641.

The spelling of 166113641 in words is "one hundred sixty-six million, one hundred thirteen thousand, six hundred forty-one".