84704863681 has 3 divisors (see below), whose sum is σ = 84705154723. Its totient is φ = 84704572640.

The previous prime is 84704863637. The next prime is 84704863723. The reversal of 84704863681 is 18636840748.

The square root of 84704863681 is 291041.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 63423889281 + 21280974400 = 251841^2 + 145880^2 .

It is not a de Polignac number, because 84704863681 - 2¹⁵ = 84704830913 is a prime.

It is a super-2 number, since 2×84704863681² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84704863081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 145521 + ... + 436561.

Almost surely, 2^84704863681 is an apocalyptic number.

84704863681 is the 291041-st square number.

84704863681 is the 145521-st centered octagonal number.

It is an amenable number.

84704863681 is a deficient number, since it is larger than the sum of its proper divisors (291042).

84704863681 is an frugal number, since it uses more digits than its factorization.

84704863681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 582082 (or 291041 counting only the distinct ones).

The product of its (nonzero) digits is 6193152, while the sum is 55.

The spelling of 84704863681 in words is "eighty-four billion, seven hundred four million, eight hundred sixty-three thousand, six hundred eighty-one".