67525561 has 2 divisors, whose sum is σ = 67525562. Its totient is φ = 67525560.

The previous prime is 67525553. The next prime is 67525583. The reversal of 67525561 is 16552576.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34105600 + 33419961 = 5840^2 + 5781^2 .

It is a cyclic number.

It is not a de Polignac number, because 67525561 - 2³ = 67525553 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 67525561.

It is not a weakly prime, because it can be changed into another prime (67525531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33762780 + 33762781.

It is an arithmetic number, because the mean of its divisors is an integer number (33762781).

Almost surely, 2^67525561 is an apocalyptic number.

It is an amenable number.

67525561 is a deficient number, since it is larger than the sum of its proper divisors (1).

67525561 is an equidigital number, since it uses as much as digits as its factorization.

67525561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63000, while the sum is 37.

The square root of 67525561 is about 8217.3938082582. The cubic root of 67525561 is about 407.2140309874.

It can be divided in two parts, 67525 and 561, that added together give a palindrome (68086).

The spelling of 67525561 in words is "sixty-seven million, five hundred twenty-five thousand, five hundred sixty-one".