84664669 has 2 divisors, whose sum is σ = 84664670. Its totient is φ = 84664668.

The previous prime is 84664667. The next prime is 84664681. The reversal of 84664669 is 96646648.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80317444 + 4347225 = 8962^2 + 2085^2 .

It is a cyclic number.

It is not a de Polignac number, because 84664669 - 2¹ = 84664667 is a prime.

It is a super-2 number, since 2×84664669² = 14336212353759122, which contains 22 as substring.

Together with 84664667, 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 (84664663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42332334 + 42332335.

It is an arithmetic number, because the mean of its divisors is an integer number (42332335).

Almost surely, 2^84664669 is an apocalyptic number.

It is an amenable number.

84664669 is a deficient number, since it is larger than the sum of its proper divisors (1).

84664669 is an equidigital number, since it uses as much as digits as its factorization.

84664669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1492992, while the sum is 49.

The square root of 84664669 is about 9201.3406088461. The cubic root of 84664669 is about 439.1040117596.

The spelling of 84664669 in words is "eighty-four million, six hundred sixty-four thousand, six hundred sixty-nine".