786604818561 has 4 divisors (see below), whose sum is σ = 1048806424752. Its totient is φ = 524403212372.

The previous prime is 786604818551. The next prime is 786604818563. The reversal of 786604818561 is 165818406687.

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, and also an emirpimes, since its reverse is a distinct semiprime: 165818406687 = 3 ⋅55272802229.

It is a cyclic number.

It is not a de Polignac number, because 786604818561 - 2³³ = 778014883969 is a prime.

It is a super-2 number, since 2×786604818561² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 786604818495 and 786604818504.

It is not an unprimeable number, because it can be changed into a prime (786604818563) 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, 131100803091 + ... + 131100803096.

It is an arithmetic number, because the mean of its divisors is an integer number (262201606188).

Almost surely, 2^786604818561 is an apocalyptic number.

It is an amenable number.

786604818561 is a deficient number, since it is larger than the sum of its proper divisors (262201606191).

786604818561 is a wasteful number, since it uses less digits than its factorization.

786604818561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262201606190.

The product of its (nonzero) digits is 15482880, while the sum is 60.

The spelling of 786604818561 in words is "seven hundred eighty-six billion, six hundred four million, eight hundred eighteen thousand, five hundred sixty-one".