7994556385 has 4 divisors (see below), whose sum is σ = 9593467668. Its totient is φ = 6395645104.

The previous prime is 7994556373. The next prime is 7994556389. The reversal of 7994556385 is 5836554997.

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 5763694561 + 2230861824 = 75919^2 + 47232^2 .

It is a cyclic number.

It is not a de Polignac number, because 7994556385 - 2¹³ = 7994548193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7994556389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 799455634 + ... + 799455643.

It is an arithmetic number, because the mean of its divisors is an integer number (2398366917).

Almost surely, 2^7994556385 is an apocalyptic number.

It is an amenable number.

7994556385 is a deficient number, since it is larger than the sum of its proper divisors (1598911283).

7994556385 is a wasteful number, since it uses less digits than its factorization.

7994556385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1598911282.

The product of its digits is 40824000, while the sum is 61.

The square root of 7994556385 is about 89412.2831886089. The cubic root of 7994556385 is about 1999.5462624856.

The spelling of 7994556385 in words is "seven billion, nine hundred ninety-four million, five hundred fifty-six thousand, three hundred eighty-five".