66542075 has 12 divisors (see below), whose sum is σ = 82618968. Its totient is φ = 53164800.

The previous prime is 66542053. The next prime is 66542093. The reversal of 66542075 is 57024566.

It is not a de Polignac number, because 66542075 - 2⁶ = 66542011 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28139 + ... + 30411.

It is an arithmetic number, because the mean of its divisors is an integer number (6884914).

Almost surely, 2^66542075 is an apocalyptic number.

66542075 is a deficient number, since it is larger than the sum of its proper divisors (16076893).

66542075 is a wasteful number, since it uses less digits than its factorization.

66542075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3454 (or 3449 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 35.

The square root of 66542075 is about 8157.3325909883. The cubic root of 66542075 is about 405.2273782892.

The spelling of 66542075 in words is "sixty-six million, five hundred forty-two thousand, seventy-five".