7775325816865 has 4 divisors (see below), whose sum is σ = 9330390980244. Its totient is φ = 6220260653488.

The previous prime is 7775325816851. The next prime is 7775325816901. The reversal of 7775325816865 is 5686185235777.

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 1077493824576 + 6697831992289 = 1038024^2 + 2588017^2 .

It is a cyclic number.

It is not a de Polignac number, because 7775325816865 - 2¹⁵ = 7775325784097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 7775325816794 and 7775325816803.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 777532581682 + ... + 777532581691.

It is an arithmetic number, because the mean of its divisors is an integer number (2332597745061).

Almost surely, 2^{7775325816865} is an apocalyptic number.

It is an amenable number.

7775325816865 is a deficient number, since it is larger than the sum of its proper divisors (1555065163379).

7775325816865 is a wasteful number, since it uses less digits than its factorization.

7775325816865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1555065163378.

The product of its digits is 592704000, while the sum is 70.

The spelling of 7775325816865 in words is "seven trillion, seven hundred seventy-five billion, three hundred twenty-five million, eight hundred sixteen thousand, eight hundred sixty-five".