9777433901665 has 4 divisors (see below), whose sum is σ = 11732920682004. Its totient is φ = 7821947121328.

The previous prime is 9777433901657. The next prime is 9777433901671. The reversal of 9777433901665 is 5661093347779.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7034541457441 + 2742892444224 = 2652271^2 + 1656168^2 .

It is a cyclic number.

It is not a de Polignac number, because 9777433901665 - 2³ = 9777433901657 is a prime.

It is a Smith number, since the sum of its digits (67) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 9777433901665.

It is an unprimeable number.

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, 977743390162 + ... + 977743390171.

It is an arithmetic number, because the mean of its divisors is an integer number (2933230170501).

Almost surely, 2^{9777433901665} is an apocalyptic number.

It is an amenable number.

9777433901665 is a deficient number, since it is larger than the sum of its proper divisors (1955486780339).

9777433901665 is a wasteful number, since it uses less digits than its factorization.

9777433901665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1955486780338.

The product of its (nonzero) digits is 180033840, while the sum is 67.

The spelling of 9777433901665 in words is "nine trillion, seven hundred seventy-seven billion, four hundred thirty-three million, nine hundred one thousand, six hundred sixty-five".