9993499685981 has 8 divisors (see below), whose sum is σ = 11917713911424. Its totient is φ = 8193428313840.

The previous prime is 9993499685969. The next prime is 9993499685999. The reversal of 9993499685981 is 1895869943999.

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

It is not a de Polignac number, because 9993499685981 - 2¹⁰ = 9993499684957 is a prime.

It is a super-2 number, since 2×9993499685981² (a number of 27 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 (9993499685921) 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, 31035713150 + ... + 31035713471.

It is an arithmetic number, because the mean of its divisors is an integer number (1489714238928).

Almost surely, 2^{9993499685981} is an apocalyptic number.

It is an amenable number.

9993499685981 is a deficient number, since it is larger than the sum of its proper divisors (1924214225443).

9993499685981 is a wasteful number, since it uses less digits than its factorization.

9993499685981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62071426651.

The product of its digits is 12244400640, while the sum is 89.

The spelling of 9993499685981 in words is "nine trillion, nine hundred ninety-three billion, four hundred ninety-nine million, six hundred eighty-five thousand, nine hundred eighty-one".