542666 has 4 divisors (see below), whose sum is σ = 814002. Its totient is φ = 271332.

The previous prime is 542603. The next prime is 542683. The reversal of 542666 is 666245.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 469225 + 73441 = 685^2 + 271^2 .

542666 is a modest number, since divided by 666 gives 542 as remainder.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 542666.

It is an unprimeable number.

542666 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 135665 + ... + 135668.

2⁵⁴²⁶⁶⁶ is an apocalyptic number.

542666 is a deficient number, since it is larger than the sum of its proper divisors (271336).

542666 is a wasteful number, since it uses less digits than its factorization.

542666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271335.

The product of its digits is 8640, while the sum is 29.

The square root of 542666 is about 736.6586726565. The cubic root of 542666 is about 81.5663203634.

The spelling of 542666 in words is "five hundred forty-two thousand, six hundred sixty-six".