6864002189581 has 2 divisors, whose sum is σ = 6864002189582. Its totient is φ = 6864002189580.

The previous prime is 6864002189573. The next prime is 6864002189609. The reversal of 6864002189581 is 1859812004686.

It is a happy number.

6864002189581 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6862875244681 + 1126944900 = 2619709^2 + 33570^2 .

It is a cyclic number.

It is not a de Polignac number, because 6864002189581 - 2³ = 6864002189573 is a prime.

It is a super-2 number, since 2×6864002189581² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6864002189521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3432001094790 + 3432001094791.

It is an arithmetic number, because the mean of its divisors is an integer number (3432001094791).

Almost surely, 2^{6864002189581} is an apocalyptic number.

It is an amenable number.

6864002189581 is a deficient number, since it is larger than the sum of its proper divisors (1).

6864002189581 is an equidigital number, since it uses as much as digits as its factorization.

6864002189581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6635520, while the sum is 58.

The spelling of 6864002189581 in words is "six trillion, eight hundred sixty-four billion, two million, one hundred eighty-nine thousand, five hundred eighty-one".