7981724066 has 4 divisors (see below), whose sum is σ = 11972586102. Its totient is φ = 3990862032.

The previous prime is 7981724059. The next prime is 7981724087. The reversal of 7981724066 is 6604271897.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6604271897 = 271 ⋅24370007.

It can be written as a sum of positive squares in only one way, i.e., 7841988025 + 139736041 = 88555^2 + 11821^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1995431015 + ... + 1995431018.

Almost surely, 2^7981724066 is an apocalyptic number.

7981724066 is a deficient number, since it is larger than the sum of its proper divisors (3990862036).

7981724066 is a wasteful number, since it uses less digits than its factorization.

7981724066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3990862035.

The product of its (nonzero) digits is 1016064, while the sum is 50.

The square root of 7981724066 is about 89340.4951072021. The cubic root of 7981724066 is about 1998.4758442697.

The spelling of 7981724066 in words is "seven billion, nine hundred eighty-one million, seven hundred twenty-four thousand, sixty-six".