77266009 has 2 divisors, whose sum is σ = 77266010. Its totient is φ = 77266008.

The previous prime is 77265983. The next prime is 77266019. The reversal of 77266009 is 90066277.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 58369600 + 18896409 = 7640^2 + 4347^2 .

It is a cyclic number.

It is not a de Polignac number, because 77266009 - 2⁹ = 77265497 is a prime.

It is a super-2 number, since 2×77266009² = 11940072293576162, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (77266019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38633004 + 38633005.

It is an arithmetic number, because the mean of its divisors is an integer number (38633005).

Almost surely, 2^77266009 is an apocalyptic number.

It is an amenable number.

77266009 is a deficient number, since it is larger than the sum of its proper divisors (1).

77266009 is an equidigital number, since it uses as much as digits as its factorization.

77266009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31752, while the sum is 37.

The square root of 77266009 is about 8790.1085886353. The cubic root of 77266009 is about 425.9214315050.

The spelling of 77266009 in words is "seventy-seven million, two hundred sixty-six thousand, nine".