140066161 has 4 divisors (see below), whose sum is σ = 140335524. Its totient is φ = 139796800.

The previous prime is 140066149. The next prime is 140066167. The reversal of 140066161 is 161660041.

140066161 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 161660041 = 877 ⋅184333.

It can be written as a sum of positive squares in 2 ways, for example, as 20295025 + 119771136 = 4505^2 + 10944^2 .

It is a cyclic number.

It is not a de Polignac number, because 140066161 - 2⁷ = 140066033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (140066167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133900 + ... + 134941.

It is an arithmetic number, because the mean of its divisors is an integer number (35083881).

Almost surely, 2^140066161 is an apocalyptic number.

It is an amenable number.

140066161 is a deficient number, since it is larger than the sum of its proper divisors (269363).

140066161 is an equidigital number, since it uses as much as digits as its factorization.

140066161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269362.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 140066161 is about 11834.9550484993. The cubic root of 140066161 is about 519.3311926851.

The spelling of 140066161 in words is "one hundred forty million, sixty-six thousand, one hundred sixty-one".