84297864689 has 2 divisors, whose sum is σ = 84297864690. Its totient is φ = 84297864688.

The previous prime is 84297864671. The next prime is 84297864733. The reversal of 84297864689 is 98646879248.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63282433600 + 21015431089 = 251560^2 + 144967^2 .

It is a cyclic number.

It is not a de Polignac number, because 84297864689 - 2¹⁶ = 84297799153 is a prime.

It is a super-2 number, since 2×84297864689² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (84297864619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42148932344 + 42148932345.

It is an arithmetic number, because the mean of its divisors is an integer number (42148932345).

Almost surely, 2^84297864689 is an apocalyptic number.

It is an amenable number.

84297864689 is a deficient number, since it is larger than the sum of its proper divisors (1).

84297864689 is an equidigital number, since it uses as much as digits as its factorization.

84297864689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 334430208, while the sum is 71.

The spelling of 84297864689 in words is "eighty-four billion, two hundred ninety-seven million, eight hundred sixty-four thousand, six hundred eighty-nine".