77712805779 has 16 divisors (see below), whose sum is σ = 121173457152. Its totient is φ = 43374588768.

The previous prime is 77712805739. The next prime is 77712805801. The reversal of 77712805779 is 97750821777.

It is not a de Polignac number, because 77712805779 - 2⁹ = 77712805267 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77712805739) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43029444 + ... + 43031249.

It is an arithmetic number, because the mean of its divisors is an integer number (7573341072).

Almost surely, 2^77712805779 is an apocalyptic number.

77712805779 is a deficient number, since it is larger than the sum of its proper divisors (43460651373).

77712805779 is a wasteful number, since it uses less digits than its factorization.

77712805779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86060746.

The product of its (nonzero) digits is 12101040, while the sum is 60.

The spelling of 77712805779 in words is "seventy-seven billion, seven hundred twelve million, eight hundred five thousand, seven hundred seventy-nine".