77783916317 has 4 divisors (see below), whose sum is σ = 79102287840. Its totient is φ = 76465544796.

The previous prime is 77783916311. The next prime is 77783916337. The reversal of 77783916317 is 71361938777.

It is a happy number.

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 77783916317 - 2²⁰ = 77782867741 is a prime.

It is a super-2 number, since 2×77783916317² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (59), and also a Moran number because the ratio is a prime number: 1318371463 = 77783916317 / (7 + 7 + 7 + 8 + 3 + 9 + 1 + 6 + 3 + 1 + 7).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77783916311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 659185673 + ... + 659185790.

It is an arithmetic number, because the mean of its divisors is an integer number (19775571960).

Almost surely, 2^77783916317 is an apocalyptic number.

It is an amenable number.

77783916317 is a deficient number, since it is larger than the sum of its proper divisors (1318371523).

77783916317 is a wasteful number, since it uses less digits than its factorization.

77783916317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1318371522.

The product of its digits is 9335088, while the sum is 59.

The spelling of 77783916317 in words is "seventy-seven billion, seven hundred eighty-three million, nine hundred sixteen thousand, three hundred seventeen".