66434043161 has 4 divisors (see below), whose sum is σ = 67425596112. Its totient is φ = 65442490212.

The previous prime is 66434043101. The next prime is 66434043163. The reversal of 66434043161 is 16134043466.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16134043466 = 2 ⋅8067021733.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66434043161 is a prime.

It is a super-2 number, since 2×66434043161² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66434043163) 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, 495776375 + ... + 495776508.

It is an arithmetic number, because the mean of its divisors is an integer number (16856399028).

Almost surely, 2^66434043161 is an apocalyptic number.

It is an amenable number.

66434043161 is a deficient number, since it is larger than the sum of its proper divisors (991552951).

66434043161 is an equidigital number, since it uses as much as digits as its factorization.

66434043161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 991552950.

The product of its (nonzero) digits is 124416, while the sum is 38.

The spelling of 66434043161 in words is "sixty-six billion, four hundred thirty-four million, forty-three thousand, one hundred sixty-one".