9943618690 has 16 divisors (see below), whose sum is σ = 18201879360. Its totient is φ = 3910032880.

The previous prime is 9943618639. The next prime is 9943618697. The reversal of 9943618690 is 968163499.

It is a super-3 number, since 3×9943618690³ (a number of 31 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (9943618697) 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, 8426206 + ... + 8427385.

It is an arithmetic number, because the mean of its divisors is an integer number (1137617460).

Almost surely, 2^9943618690 is an apocalyptic number.

9943618690 is a deficient number, since it is larger than the sum of its proper divisors (8258260670).

9943618690 is a wasteful number, since it uses less digits than its factorization.

9943618690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16853657.

The product of its (nonzero) digits is 2519424, while the sum is 55.

The square root of 9943618690 is about 99717.6949693483. The cubic root of 9943618690 is about 2150.3780615139.

The spelling of 9943618690 in words is "nine billion, nine hundred forty-three million, six hundred eighteen thousand, six hundred ninety".