77366321 has 2 divisors, whose sum is σ = 77366322. Its totient is φ = 77366320.

The previous prime is 77366299. The next prime is 77366329. The reversal of 77366321 is 12366377.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77176225 + 190096 = 8785^2 + 436^2 .

It is a cyclic number.

It is not a de Polignac number, because 77366321 - 2¹⁸ = 77104177 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (77366329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38683160 + 38683161.

It is an arithmetic number, because the mean of its divisors is an integer number (38683161).

Almost surely, 2^77366321 is an apocalyptic number.

It is an amenable number.

77366321 is a deficient number, since it is larger than the sum of its proper divisors (1).

77366321 is an equidigital number, since it uses as much as digits as its factorization.

77366321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31752, while the sum is 35.

The square root of 77366321 is about 8795.8126969598. The cubic root of 77366321 is about 426.1056718758.

The spelling of 77366321 in words is "seventy-seven million, three hundred sixty-six thousand, three hundred twenty-one".