8020793197521 has 40 divisors (see below), whose sum is σ = 12989946215400. Its totient is φ = 4902745978368.

The previous prime is 8020793197519. The next prime is 8020793197567. The reversal of 8020793197521 is 1257913970208.

It is a happy number.

8020793197521 is a `hidden beast` number, since 8 + 0 + 20 + 7 + 9 + 3 + 1 + 97 + 521 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 870041217600 + 7150751979921 = 932760^2 + 2674089^2 .

It is not a de Polignac number, because 8020793197521 - 2¹ = 8020793197519 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8020793197511) 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 39 ways as a sum of consecutive naturals, for example, 25403800 + ... + 25717593.

It is an arithmetic number, because the mean of its divisors is an integer number (324748655385).

Almost surely, 2^{8020793197521} is an apocalyptic number.

8020793197521 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

It is an amenable number.

8020793197521 is a deficient number, since it is larger than the sum of its proper divisors (4969153017879).

8020793197521 is a wasteful number, since it uses less digits than its factorization.

8020793197521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51121567 (or 51121558 counting only the distinct ones).

The product of its (nonzero) digits is 1905120, while the sum is 54.

The spelling of 8020793197521 in words is "eight trillion, twenty billion, seven hundred ninety-three million, one hundred ninety-seven thousand, five hundred twenty-one".