168306542 has 4 divisors (see below), whose sum is σ = 252459816. Its totient is φ = 84153270.

The previous prime is 168306539. The next prime is 168306547. The reversal of 168306542 is 245603861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 245603861 = 19 ⋅12926519.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (168306547) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42076634 + ... + 42076637.

It is an arithmetic number, because the mean of its divisors is an integer number (63114954).

Almost surely, 2^168306542 is an apocalyptic number.

168306542 is a deficient number, since it is larger than the sum of its proper divisors (84153274).

168306542 is an equidigital number, since it uses as much as digits as its factorization.

168306542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84153273.

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 168306542 is about 12973.3011219196. The cubic root of 168306542 is about 552.1202369705.

The spelling of 168306542 in words is "one hundred sixty-eight million, three hundred six thousand, five hundred forty-two".