77718384677 has 4 divisors (see below), whose sum is σ = 80225429376. Its totient is φ = 75211339980.

The previous prime is 77718384631. The next prime is 77718384703. The reversal of 77718384677 is 77648381777.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 77718384677 - 2¹⁸ = 77718122533 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 (77718384607) 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, 1253522303 + ... + 1253522364.

It is an arithmetic number, because the mean of its divisors is an integer number (20056357344).

Almost surely, 2^77718384677 is an apocalyptic number.

It is an amenable number.

77718384677 is a deficient number, since it is larger than the sum of its proper divisors (2507044699).

77718384677 is a wasteful number, since it uses less digits than its factorization.

77718384677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2507044698.

The product of its digits is 77446656, while the sum is 65.

The spelling of 77718384677 in words is "seventy-seven billion, seven hundred eighteen million, three hundred eighty-four thousand, six hundred seventy-seven".