77838823065785 has 8 divisors (see below), whose sum is σ = 93407661679560. Its totient is φ = 62270342452224.

The previous prime is 77838823065763. The next prime is 77838823065841. The reversal of 77838823065785 is 58756032883877.

It can be written as a sum of positive squares in 4 ways, for example, as 2117639054521 + 75721184011264 = 1455211^2 + 8701792^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77838823065785 - 2²⁴ = 77838806288569 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89021480 + ... + 89891609.

It is an arithmetic number, because the mean of its divisors is an integer number (11675957709945).

Almost surely, 2^{77838823065785} is an apocalyptic number.

It is an amenable number.

77838823065785 is a deficient number, since it is larger than the sum of its proper divisors (15568838613775).

77838823065785 is a wasteful number, since it uses less digits than its factorization.

77838823065785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179000107.

The product of its (nonzero) digits is 3793305600, while the sum is 77.

The spelling of 77838823065785 in words is "seventy-seven trillion, eight hundred thirty-eight billion, eight hundred twenty-three million, sixty-five thousand, seven hundred eighty-five".