7925943985 has 4 divisors (see below), whose sum is σ = 9511132788. Its totient is φ = 6340755184.

The previous prime is 7925943953. The next prime is 7925944007. The reversal of 7925943985 is 5893495297.

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 4608644769 + 3317299216 = 67887^2 + 57596^2 .

It is a cyclic number.

It is not a de Polignac number, because 7925943985 - 2⁵ = 7925943953 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 792594394 + ... + 792594403.

It is an arithmetic number, because the mean of its divisors is an integer number (2377783197).

Almost surely, 2^7925943985 is an apocalyptic number.

It is an amenable number.

7925943985 is a deficient number, since it is larger than the sum of its proper divisors (1585188803).

7925943985 is a wasteful number, since it uses less digits than its factorization.

7925943985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1585188802.

The product of its digits is 24494400, while the sum is 61.

The square root of 7925943985 is about 89027.7708639276. The cubic root of 7925943985 is about 1993.8095241906.

The spelling of 7925943985 in words is "seven billion, nine hundred twenty-five million, nine hundred forty-three thousand, nine hundred eighty-five".