66042542 has 4 divisors (see below), whose sum is σ = 99063816. Its totient is φ = 33021270.

The previous prime is 66042533. The next prime is 66042551. The reversal of 66042542 is 24524066.

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

It is an interprime number because it is at equal distance from previous prime (66042533) and next prime (66042551).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16510634 + ... + 16510637.

It is an arithmetic number, because the mean of its divisors is an integer number (24765954).

Almost surely, 2^66042542 is an apocalyptic number.

66042542 is a deficient number, since it is larger than the sum of its proper divisors (33021274).

66042542 is a wasteful number, since it uses less digits than its factorization.

66042542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33021273.

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 66042542 is about 8126.6562619567. The cubic root of 66042542 is about 404.2108129244.

The spelling of 66042542 in words is "sixty-six million, forty-two thousand, five hundred forty-two".