7779071345 has 4 divisors (see below), whose sum is σ = 9334885620. Its totient is φ = 6223257072.

The previous prime is 7779071341. The next prime is 7779071347. The reversal of 7779071345 is 5431709777.

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 2793016801 + 4986054544 = 52849^2 + 70612^2 .

It is a cyclic number.

It is not a de Polignac number, because 7779071345 - 2² = 7779071341 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7779071293 and 7779071302.

It is not an unprimeable number, because it can be changed into a prime (7779071341) 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, 777907130 + ... + 777907139.

It is an arithmetic number, because the mean of its divisors is an integer number (2333721405).

Almost surely, 2^7779071345 is an apocalyptic number.

It is an amenable number.

7779071345 is a deficient number, since it is larger than the sum of its proper divisors (1555814275).

7779071345 is a wasteful number, since it uses less digits than its factorization.

7779071345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1555814274.

The product of its (nonzero) digits is 1296540, while the sum is 50.

The square root of 7779071345 is about 88199.0439007136. The cubic root of 7779071345 is about 1981.4171523933.

The spelling of 7779071345 in words is "seven billion, seven hundred seventy-nine million, seventy-one thousand, three hundred forty-five".