77110778009 has 2 divisors, whose sum is σ = 77110778010. Its totient is φ = 77110778008.

The previous prime is 77110777999. The next prime is 77110778033. The reversal of 77110778009 is 90087701177.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71182240000 + 5928538009 = 266800^2 + 76997^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-77110778009 is a prime.

It is not a weakly prime, because it can be changed into another prime (77110778909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38555389004 + 38555389005.

It is an arithmetic number, because the mean of its divisors is an integer number (38555389005).

Almost surely, 2^77110778009 is an apocalyptic number.

It is an amenable number.

77110778009 is a deficient number, since it is larger than the sum of its proper divisors (1).

77110778009 is an equidigital number, since it uses as much as digits as its factorization.

77110778009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 172872, while the sum is 47.

The spelling of 77110778009 in words is "seventy-seven billion, one hundred ten million, seven hundred seventy-eight thousand, nine".