7958648821 has 4 divisors (see below), whose sum is σ = 8426804652. Its totient is φ = 7490492992.

The previous prime is 7958648813. The next prime is 7958648857. The reversal of 7958648821 is 1288468597.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1288468597 = 13 ⋅99112969.

It can be written as a sum of positive squares in 2 ways, for example, as 7241159025 + 717489796 = 85095^2 + 26786^2 .

It is a cyclic number.

It is not a de Polignac number, because 7958648821 - 2³ = 7958648813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7958648881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 234077890 + ... + 234077923.

It is an arithmetic number, because the mean of its divisors is an integer number (2106701163).

Almost surely, 2^7958648821 is an apocalyptic number.

It is an amenable number.

7958648821 is a deficient number, since it is larger than the sum of its proper divisors (468155831).

7958648821 is a wasteful number, since it uses less digits than its factorization.

7958648821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 468155830.

The product of its digits is 7741440, while the sum is 58.

The square root of 7958648821 is about 89211.2594967698. The cubic root of 7958648821 is about 1996.5481140861.

The spelling of 7958648821 in words is "seven billion, nine hundred fifty-eight million, six hundred forty-eight thousand, eight hundred twenty-one".