68577521 has 2 divisors, whose sum is σ = 68577522. Its totient is φ = 68577520.

The previous prime is 68577497. The next prime is 68577527. The reversal of 68577521 is 12577586.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 57760000 + 10817521 = 7600^2 + 3289^2 .

It is a cyclic number.

It is not a de Polignac number, because 68577521 - 2²² = 64383217 is a prime.

It is not a weakly prime, because it can be changed into another prime (68577527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34288760 + 34288761.

It is an arithmetic number, because the mean of its divisors is an integer number (34288761).

Almost surely, 2^68577521 is an apocalyptic number.

It is an amenable number.

68577521 is a deficient number, since it is larger than the sum of its proper divisors (1).

68577521 is an equidigital number, since it uses as much as digits as its factorization.

68577521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 117600, while the sum is 41.

The square root of 68577521 is about 8281.1545692615. The cubic root of 68577521 is about 409.3177648631.

The spelling of 68577521 in words is "sixty-eight million, five hundred seventy-seven thousand, five hundred twenty-one".