67536661 has 2 divisors, whose sum is σ = 67536662. Its totient is φ = 67536660.

The previous prime is 67536653. The next prime is 67536719. The reversal of 67536661 is 16663576.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53802225 + 13734436 = 7335^2 + 3706^2 .

It is a cyclic number.

It is not a de Polignac number, because 67536661 - 2³ = 67536653 is a prime.

It is a super-2 number, since 2×67536661² = 9122401158057842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (67536361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33768330 + 33768331.

It is an arithmetic number, because the mean of its divisors is an integer number (33768331).

Almost surely, 2^67536661 is an apocalyptic number.

It is an amenable number.

67536661 is a deficient number, since it is larger than the sum of its proper divisors (1).

67536661 is an equidigital number, since it uses as much as digits as its factorization.

67536661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 136080, while the sum is 40.

The square root of 67536661 is about 8218.0691771243. The cubic root of 67536661 is about 407.2363426771.

The spelling of 67536661 in words is "sixty-seven million, five hundred thirty-six thousand, six hundred sixty-one".