67563521 has 2 divisors, whose sum is σ = 67563522. Its totient is φ = 67563520.

The previous prime is 67563497. The next prime is 67563527. The reversal of 67563521 is 12536576.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65431921 + 2131600 = 8089^2 + 1460^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67563521 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (67563527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33781760 + 33781761.

It is an arithmetic number, because the mean of its divisors is an integer number (33781761).

Almost surely, 2^67563521 is an apocalyptic number.

It is an amenable number.

67563521 is a deficient number, since it is larger than the sum of its proper divisors (1).

67563521 is an equidigital number, since it uses as much as digits as its factorization.

67563521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37800, while the sum is 35.

The square root of 67563521 is about 8219.7032184867. The cubic root of 67563521 is about 407.2903228326.

The spelling of 67563521 in words is "sixty-seven million, five hundred sixty-three thousand, five hundred twenty-one".