786644661013 has 4 divisors (see below), whose sum is σ = 786648940000. Its totient is φ = 786640382028.

The previous prime is 786644661007. The next prime is 786644661017. The reversal of 786644661013 is 310166446687.

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 a de Polignac number, because none of the positive numbers 2^k-786644661013 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 (786644661017) 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, 1850745 + ... + 2235742.

It is an arithmetic number, because the mean of its divisors is an integer number (196662235000).

Almost surely, 2^786644661013 is an apocalyptic number.

It is an amenable number.

786644661013 is a deficient number, since it is larger than the sum of its proper divisors (4278987).

786644661013 is a wasteful number, since it uses less digits than its factorization.

786644661013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4278986.

The product of its (nonzero) digits is 3483648, while the sum is 52.

The spelling of 786644661013 in words is "seven hundred eighty-six billion, six hundred forty-four million, six hundred sixty-one thousand, thirteen".