75520066 has 4 divisors (see below), whose sum is σ = 113280102. Its totient is φ = 37760032.

The previous prime is 75520057. The next prime is 75520091. The reversal of 75520066 is 66002557.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66002557 = 887 ⋅74411.

It can be written as a sum of positive squares in only one way, i.e., 52142841 + 23377225 = 7221^2 + 4835^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18880015 + ... + 18880018.

Almost surely, 2^75520066 is an apocalyptic number.

75520066 is a deficient number, since it is larger than the sum of its proper divisors (37760036).

75520066 is a wasteful number, since it uses less digits than its factorization.

75520066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37760035.

The product of its (nonzero) digits is 12600, while the sum is 31.

The square root of 75520066 is about 8690.2281903296. The cubic root of 75520066 is about 422.6888452384.

The spelling of 75520066 in words is "seventy-five million, five hundred twenty thousand, sixty-six".