77757783320485 has 4 divisors (see below), whose sum is σ = 93309339984588. Its totient is φ = 62206226656384.

The previous prime is 77757783320387. The next prime is 77757783320489. The reversal of 77757783320485 is 58402338775777.

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

It can be written as a sum of positive squares in 2 ways, for example, as 29717663834881 + 48040119485604 = 5451391^2 + 6931098^2 .

It is a cyclic number.

It is not a de Polignac number, because 77757783320485 - 2²⁹ = 77757246449573 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 (77757783320489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7775778332044 + ... + 7775778332053.

It is an arithmetic number, because the mean of its divisors is an integer number (23327334996147).

Almost surely, 2^{77757783320485} is an apocalyptic number.

It is an amenable number.

77757783320485 is a deficient number, since it is larger than the sum of its proper divisors (15551556664103).

77757783320485 is a wasteful number, since it uses less digits than its factorization.

77757783320485 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15551556664102.

The product of its (nonzero) digits is 1936166400, while the sum is 73.

The spelling of 77757783320485 in words is "seventy-seven trillion, seven hundred fifty-seven billion, seven hundred eighty-three million, three hundred twenty thousand, four hundred eighty-five".