7958245681 has 3 divisors (see below), whose sum is σ = 7958334891. Its totient is φ = 7958156472.

The previous prime is 7958245639. The next prime is 7958245697. The reversal of 7958245681 is 1865428597.

It is a happy number.

The square root of 7958245681 is 89209.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1865428597 = 15263 ⋅122219.

It can be written as a sum of positive squares in only one way, i.e., 2115172081 + 5843073600 = 45991^2 + 76440^2 .

It is not a de Polignac number, because 7958245681 - 2⁷ = 7958245553 is a prime.

It is a super-2 number, since 2×7958245681² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7958245481) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 44605 + ... + 133813.

It is an arithmetic number, because the mean of its divisors is an integer number (2652778297).

Almost surely, 2^7958245681 is an apocalyptic number.

7958245681 is the 89209-th square number.

7958245681 is the 44605-th centered octagonal number.

It is an amenable number.

7958245681 is a deficient number, since it is larger than the sum of its proper divisors (89210).

7958245681 is an frugal number, since it uses more digits than its factorization.

7958245681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178418 (or 89209 counting only the distinct ones).

The product of its digits is 4838400, while the sum is 55.

The cubic root of 7958245681 is about 1996.5144022498.

The spelling of 7958245681 in words is "seven billion, nine hundred fifty-eight million, two hundred forty-five thousand, six hundred eighty-one".