77536681 has 2 divisors, whose sum is σ = 77536682. Its totient is φ = 77536680.

The previous prime is 77536651. The next prime is 77536687. The reversal of 77536681 is 18663577.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 75846681 + 1690000 = 8709^2 + 1300^2 .

It is a cyclic number.

It is not a de Polignac number, because 77536681 - 2¹⁷ = 77405609 is a prime.

It is a super-2 number, since 2×77536681² = 12023873800991522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (77536687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38768340 + 38768341.

It is an arithmetic number, because the mean of its divisors is an integer number (38768341).

Almost surely, 2^77536681 is an apocalyptic number.

It is an amenable number.

77536681 is a deficient number, since it is larger than the sum of its proper divisors (1).

77536681 is an equidigital number, since it uses as much as digits as its factorization.

77536681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 211680, while the sum is 43.

The square root of 77536681 is about 8805.4915251790. The cubic root of 77536681 is about 426.4182029812.

The spelling of 77536681 in words is "seventy-seven million, five hundred thirty-six thousand, six hundred eighty-one".