7945396985 has 4 divisors (see below), whose sum is σ = 9534476388. Its totient is φ = 6356317584.

The previous prime is 7945396969. The next prime is 7945396993. The reversal of 7945396985 is 5896935497.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5896935497 = 167 ⋅35310991.

It can be written as a sum of positive squares in 2 ways, for example, as 3847348729 + 4098048256 = 62027^2 + 64016^2 .

It is a cyclic number.

It is not a de Polignac number, because 7945396985 - 2⁴ = 7945396969 is a prime.

It is a Duffinian number.

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, 794539694 + ... + 794539703.

It is an arithmetic number, because the mean of its divisors is an integer number (2383619097).

Almost surely, 2^7945396985 is an apocalyptic number.

It is an amenable number.

7945396985 is a deficient number, since it is larger than the sum of its proper divisors (1589079403).

7945396985 is a wasteful number, since it uses less digits than its factorization.

7945396985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1589079402.

The product of its digits is 73483200, while the sum is 65.

The square root of 7945396985 is about 89136.9563368640. The cubic root of 7945396985 is about 1995.4393569223.

The spelling of 7945396985 in words is "seven billion, nine hundred forty-five million, three hundred ninety-six thousand, nine hundred eighty-five".