785791138657 has 16 divisors (see below), whose sum is σ = 927075177472. Its totient is φ = 651766901760.

The previous prime is 785791138637. The next prime is 785791138663. The reversal of 785791138657 is 756831197587.

It is a cyclic number.

It is not a de Polignac number, because 785791138657 - 2³⁹ = 236035324769 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 785791138592 and 785791138601.

It is not an unprimeable number, because it can be changed into a prime (785791138637) 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 15 ways as a sum of consecutive naturals, for example, 3580933 + ... + 3794029.

It is an arithmetic number, because the mean of its divisors is an integer number (57942198592).

Almost surely, 2^785791138657 is an apocalyptic number.

It is an amenable number.

785791138657 is a deficient number, since it is larger than the sum of its proper divisors (141284038815).

785791138657 is a wasteful number, since it uses less digits than its factorization.

785791138657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230128.

The product of its digits is 88905600, while the sum is 67.

The spelling of 785791138657 in words is "seven hundred eighty-five billion, seven hundred ninety-one million, one hundred thirty-eight thousand, six hundred fifty-seven".