161126666 has 4 divisors (see below), whose sum is σ = 241690002. Its totient is φ = 80563332.

The previous prime is 161126653. The next prime is 161126683. The reversal of 161126666 is 666621161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 666621161 = 797 ⋅836413.

It can be written as a sum of positive squares in only one way, i.e., 139736041 + 21390625 = 11821^2 + 4625^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40281665 + ... + 40281668.

Almost surely, 2^161126666 is an apocalyptic number.

161126666 is a deficient number, since it is larger than the sum of its proper divisors (80563336).

161126666 is an equidigital number, since it uses as much as digits as its factorization.

161126666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80563335.

The product of its digits is 15552, while the sum is 35.

The square root of 161126666 is about 12693.5678987430. The cubic root of 161126666 is about 544.1548114939.

The spelling of 161126666 in words is "one hundred sixty-one million, one hundred twenty-six thousand, six hundred sixty-six".