75666989 has 2 divisors, whose sum is σ = 75666990. Its totient is φ = 75666988.

The previous prime is 75666973. The next prime is 75667019. The reversal of 75666989 is 98966657.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41538025 + 34128964 = 6445^2 + 5842^2 .

It is a cyclic number.

It is not a de Polignac number, because 75666989 - 2⁴ = 75666973 is a prime.

It is a super-2 number, since 2×75666989² = 11450986448652242, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (75666089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37833494 + 37833495.

It is an arithmetic number, because the mean of its divisors is an integer number (37833495).

Almost surely, 2^75666989 is an apocalyptic number.

It is an amenable number.

75666989 is a deficient number, since it is larger than the sum of its proper divisors (1).

75666989 is an equidigital number, since it uses as much as digits as its factorization.

75666989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4898880, while the sum is 56.

The square root of 75666989 is about 8698.6774282071. The cubic root of 75666989 is about 422.9627789830.

The spelling of 75666989 in words is "seventy-five million, six hundred sixty-six thousand, nine hundred eighty-nine".