916778056709 has 4 divisors (see below), whose sum is σ = 922849434720. Its totient is φ = 910706678700.

The previous prime is 916778056703. The next prime is 916778056717. The reversal of 916778056709 is 907650877619.

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: 907650877619 = 4651 ⋅195151769.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-916778056709 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 (916778056703) 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, 3035688779 + ... + 3035689080.

It is an arithmetic number, because the mean of its divisors is an integer number (230712358680).

Almost surely, 2^916778056709 is an apocalyptic number.

It is an amenable number.

916778056709 is a deficient number, since it is larger than the sum of its proper divisors (6071378011).

916778056709 is a wasteful number, since it uses less digits than its factorization.

916778056709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6071378010.

The product of its (nonzero) digits is 40007520, while the sum is 65.

The spelling of 916778056709 in words is "nine hundred sixteen billion, seven hundred seventy-eight million, fifty-six thousand, seven hundred nine".