75666361 has 4 divisors (see below), whose sum is σ = 77511924. Its totient is φ = 73820800.

The previous prime is 75666359. The next prime is 75666373. The reversal of 75666361 is 16366657.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7290000 + 68376361 = 2700^2 + 8269^2 .

It is a cyclic number.

It is not a de Polignac number, because 75666361 - 2¹ = 75666359 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75666301) 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, 922720 + ... + 922801.

It is an arithmetic number, because the mean of its divisors is an integer number (19377981).

Almost surely, 2^75666361 is an apocalyptic number.

It is an amenable number.

75666361 is a deficient number, since it is larger than the sum of its proper divisors (1845563).

75666361 is a wasteful number, since it uses less digits than its factorization.

75666361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1845562.

The product of its digits is 136080, while the sum is 40.

The square root of 75666361 is about 8698.6413306907. The cubic root of 75666361 is about 422.9616088499.

The spelling of 75666361 in words is "seventy-five million, six hundred sixty-six thousand, three hundred sixty-one".