75266561 has 2 divisors, whose sum is σ = 75266562. Its totient is φ = 75266560.

The previous prime is 75266549. The next prime is 75266563. The reversal of 75266561 is 16566257.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38056561 + 37210000 = 6169^2 + 6100^2 .

It is a cyclic number.

It is not a de Polignac number, because 75266561 - 2¹⁰ = 75265537 is a prime.

Together with 75266563, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (75266563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37633280 + 37633281.

It is an arithmetic number, because the mean of its divisors is an integer number (37633281).

Almost surely, 2^75266561 is an apocalyptic number.

It is an amenable number.

75266561 is a deficient number, since it is larger than the sum of its proper divisors (1).

75266561 is an equidigital number, since it uses as much as digits as its factorization.

75266561 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75600, while the sum is 38.

The square root of 75266561 is about 8675.6302941054. The cubic root of 75266561 is about 422.2153558158.

The spelling of 75266561 in words is "seventy-five million, two hundred sixty-six thousand, five hundred sixty-one".