67526561 has 2 divisors, whose sum is σ = 67526562. Its totient is φ = 67526560.

The previous prime is 67526539. The next prime is 67526579. The reversal of 67526561 is 16562576.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 48385936 + 19140625 = 6956^2 + 4375^2 .

It is a cyclic number.

It is not a de Polignac number, because 67526561 - 2²² = 63332257 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (67526531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33763280 + 33763281.

It is an arithmetic number, because the mean of its divisors is an integer number (33763281).

Almost surely, 2^67526561 is an apocalyptic number.

It is an amenable number.

67526561 is a deficient number, since it is larger than the sum of its proper divisors (1).

67526561 is an equidigital number, since it uses as much as digits as its factorization.

67526561 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 67526561 is about 8217.4546545752. The cubic root of 67526561 is about 407.2160411497.

The spelling of 67526561 in words is "sixty-seven million, five hundred twenty-six thousand, five hundred sixty-one".