161166542 has 4 divisors (see below), whose sum is σ = 241749816. Its totient is φ = 80583270.

The previous prime is 161166541. The next prime is 161166547. The reversal of 161166542 is 245661161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 245661161 = 13679 ⋅17959.

It is a junction number, because it is equal to n+sod(n) for n = 161166499 and 161166508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161166541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40291634 + ... + 40291637.

It is an arithmetic number, because the mean of its divisors is an integer number (60437454).

Almost surely, 2^161166542 is an apocalyptic number.

161166542 is a deficient number, since it is larger than the sum of its proper divisors (80583274).

161166542 is an equidigital number, since it uses as much as digits as its factorization.

161166542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80583273.

The product of its digits is 8640, while the sum is 32.

The square root of 161166542 is about 12695.1385183463. The cubic root of 161166542 is about 544.1996973551.

The spelling of 161166542 in words is "one hundred sixty-one million, one hundred sixty-six thousand, five hundred forty-two".