6523066372021 has 2 divisors, whose sum is σ = 6523066372022. Its totient is φ = 6523066372020.

The previous prime is 6523066372019. The next prime is 6523066372057. The reversal of 6523066372021 is 1202736603256.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5563871393796 + 959194978225 = 2358786^2 + 979385^2 .

It is a cyclic number.

It is not a de Polignac number, because 6523066372021 - 2¹ = 6523066372019 is a prime.

It is a super-2 number, since 2×6523066372021² (a number of 26 digits) contains 22 as substring.

Together with 6523066372019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6523066372091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3261533186010 + 3261533186011.

It is an arithmetic number, because the mean of its divisors is an integer number (3261533186011).

Almost surely, 2^{6523066372021} is an apocalyptic number.

It is an amenable number.

6523066372021 is a deficient number, since it is larger than the sum of its proper divisors (1).

6523066372021 is an equidigital number, since it uses as much as digits as its factorization.

6523066372021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 544320, while the sum is 43.

The spelling of 6523066372021 in words is "six trillion, five hundred twenty-three billion, sixty-six million, three hundred seventy-two thousand, twenty-one".