8021478813 has 4 divisors (see below), whose sum is σ = 10695305088. Its totient is φ = 5347652540.

The previous prime is 8021478799. The next prime is 8021478869. The reversal of 8021478813 is 3188741208.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 8021478813 - 2⁸ = 8021478557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8021479813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1336913133 + ... + 1336913138.

It is an arithmetic number, because the mean of its divisors is an integer number (2673826272).

Almost surely, 2^8021478813 is an apocalyptic number.

It is an amenable number.

8021478813 is a deficient number, since it is larger than the sum of its proper divisors (2673826275).

8021478813 is a wasteful number, since it uses less digits than its factorization.

8021478813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2673826274.

The product of its (nonzero) digits is 86016, while the sum is 42.

The square root of 8021478813 is about 89562.7088301822. The cubic root of 8021478813 is about 2001.7883015954.

The spelling of 8021478813 in words is "eight billion, twenty-one million, four hundred seventy-eight thousand, eight hundred thirteen".