7971811457 has 8 divisors (see below), whose sum is σ = 7996635360. Its totient is φ = 7947016000.

The previous prime is 7971811451. The next prime is 7971811459. The reversal of 7971811457 is 7541181797.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7971811457 - 2²⁶ = 7904702593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7971811451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 644582 + ... + 656832.

It is an arithmetic number, because the mean of its divisors is an integer number (999579420).

Almost surely, 2^7971811457 is an apocalyptic number.

It is an amenable number.

7971811457 is a deficient number, since it is larger than the sum of its proper divisors (24823903).

7971811457 is a wasteful number, since it uses less digits than its factorization.

7971811457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14223.

The product of its digits is 493920, while the sum is 50.

The square root of 7971811457 is about 89285.0012992104. The cubic root of 7971811457 is about 1997.6481903296.

The spelling of 7971811457 in words is "seven billion, nine hundred seventy-one million, eight hundred eleven thousand, four hundred fifty-seven".