77440776671 has 4 divisors (see below), whose sum is σ = 79329576144. Its totient is φ = 75551977200.

The previous prime is 77440776667. The next prime is 77440776691. The reversal of 77440776671 is 17667704477.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 77440776671 - 2² = 77440776667 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 (77440776641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 944399675 + ... + 944399756.

It is an arithmetic number, because the mean of its divisors is an integer number (19832394036).

Almost surely, 2^77440776671 is an apocalyptic number.

77440776671 is a deficient number, since it is larger than the sum of its proper divisors (1888799473).

77440776671 is a wasteful number, since it uses less digits than its factorization.

77440776671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1888799472.

The product of its (nonzero) digits is 9680832, while the sum is 56.

The spelling of 77440776671 in words is "seventy-seven billion, four hundred forty million, seven hundred seventy-six thousand, six hundred seventy-one".