77311978567 has 4 divisors (see below), whose sum is σ = 77324590600. Its totient is φ = 77299366536.

The previous prime is 77311978537. The next prime is 77311978589. The reversal of 77311978567 is 76587911377.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76587911377 = 293 ⋅261392189.

It is a cyclic number.

It is not a de Polignac number, because 77311978567 - 2¹¹ = 77311976519 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77311978517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6296817 + ... + 6309082.

It is an arithmetic number, because the mean of its divisors is an integer number (19331147650).

Almost surely, 2^77311978567 is an apocalyptic number.

77311978567 is a deficient number, since it is larger than the sum of its proper divisors (12612033).

77311978567 is a wasteful number, since it uses less digits than its factorization.

77311978567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12612032.

The product of its digits is 15558480, while the sum is 61.

The spelling of 77311978567 in words is "seventy-seven billion, three hundred eleven million, nine hundred seventy-eight thousand, five hundred sixty-seven".