77766673 has 2 divisors, whose sum is σ = 77766674. Its totient is φ = 77766672.

The previous prime is 77766641. The next prime is 77766679. The reversal of 77766673 is 37666777.

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., 49112064 + 28654609 = 7008^2 + 5353^2 .

It is a cyclic number.

It is not a de Polignac number, because 77766673 - 2⁵ = 77766641 is a prime.

It is not a weakly prime, because it can be changed into another prime (77766679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38883336 + 38883337.

It is an arithmetic number, because the mean of its divisors is an integer number (38883337).

Almost surely, 2^77766673 is an apocalyptic number.

It is an amenable number.

77766673 is a deficient number, since it is larger than the sum of its proper divisors (1).

77766673 is an equidigital number, since it uses as much as digits as its factorization.

77766673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1555848, while the sum is 49.

The square root of 77766673 is about 8818.5414326860. The cubic root of 77766673 is about 426.8394056284.

The spelling of 77766673 in words is "seventy-seven million, seven hundred sixty-six thousand, six hundred seventy-three".