75172066 has 4 divisors (see below), whose sum is σ = 112758102. Its totient is φ = 37586032.

The previous prime is 75172039. The next prime is 75172067. The reversal of 75172066 is 66027157.

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., 58599025 + 16573041 = 7655^2 + 4071^2 .

It is not an unprimeable number, because it can be changed into a prime (75172067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18793015 + ... + 18793018.

Almost surely, 2^75172066 is an apocalyptic number.

75172066 is a deficient number, since it is larger than the sum of its proper divisors (37586036).

75172066 is a wasteful number, since it uses less digits than its factorization.

75172066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37586035.

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 75172066 is about 8670.1825816992. The cubic root of 75172066 is about 422.0385887460.

The spelling of 75172066 in words is "seventy-five million, one hundred seventy-two thousand, sixty-six".