9949864581 has 32 divisors (see below), whose sum is σ = 14901536000. Its totient is φ = 6560953344.

The previous prime is 9949864541. The next prime is 9949864597. The reversal of 9949864581 is 1854689499.

9949864581 is a `hidden beast` number, since 9 + 9 + 49 + 8 + 6 + 4 + 581 = 666.

It is not a de Polignac number, because 9949864581 - 2¹⁵ = 9949831813 is a prime.

It is a super-2 number, since 2×9949864581² (a number of 21 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 (9949864541) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3138165 + ... + 3141333.

It is an arithmetic number, because the mean of its divisors is an integer number (465673000).

Almost surely, 2^9949864581 is an apocalyptic number.

It is an amenable number.

9949864581 is a deficient number, since it is larger than the sum of its proper divisors (4951671419).

9949864581 is a wasteful number, since it uses less digits than its factorization.

9949864581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4410 (or 4404 counting only the distinct ones).

The product of its digits is 22394880, while the sum is 63.

The square root of 9949864581 is about 99749.0079198786. The cubic root of 9949864581 is about 2150.8282066852.

The spelling of 9949864581 in words is "nine billion, nine hundred forty-nine million, eight hundred sixty-four thousand, five hundred eighty-one".