84899616581 has 8 divisors (see below), whose sum is σ = 96808612824. Its totient is φ = 73758942720.

The previous prime is 84899616569. The next prime is 84899616643. The reversal of 84899616581 is 18561699848.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 36506216356 + 48393400225 = 191066^2 + 219985^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 84899616581 - 2¹⁸ = 84899354437 is a prime.

It is a super-2 number, since 2×84899616581² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84899616281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 192080360 + ... + 192080801.

It is an arithmetic number, because the mean of its divisors is an integer number (12101076603).

Almost surely, 2^84899616581 is an apocalyptic number.

It is an amenable number.

84899616581 is a deficient number, since it is larger than the sum of its proper divisors (11908996243).

84899616581 is a wasteful number, since it uses less digits than its factorization.

84899616581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384161191.

The product of its digits is 29859840, while the sum is 65.

The spelling of 84899616581 in words is "eighty-four billion, eight hundred ninety-nine million, six hundred sixteen thousand, five hundred eighty-one".