75066581 has 4 divisors (see below), whose sum is σ = 75444000. Its totient is φ = 74689164.

The previous prime is 75066571. The next prime is 75066583. The reversal of 75066581 is 18566057.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-75066581 is a prime.

It is a super-2 number, since 2×75066581² = 11269983166059122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (75066583) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 188411 + ... + 188808.

It is an arithmetic number, because the mean of its divisors is an integer number (18861000).

Almost surely, 2^75066581 is an apocalyptic number.

It is an amenable number.

75066581 is a deficient number, since it is larger than the sum of its proper divisors (377419).

75066581 is a wasteful number, since it uses less digits than its factorization.

75066581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377418.

The product of its (nonzero) digits is 50400, while the sum is 38.

The square root of 75066581 is about 8664.0972409132. The cubic root of 75066581 is about 421.8410881639.

The spelling of 75066581 in words is "seventy-five million, sixty-six thousand, five hundred eighty-one".