9842816665 has 48 divisors (see below), whose sum is σ = 13501876608. Its totient is φ = 6829920000.

The previous prime is 9842816663. The next prime is 9842816729. The reversal of 9842816665 is 5666182489.

9842816665 is a nontrivial binomial coefficient, being equal to C(140306, 2).

It is not a de Polignac number, because 9842816665 - 2¹ = 9842816663 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (55).

It is not an unprimeable number, because it can be changed into a prime (9842816663) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3857140 + ... + 3859690.

It is an arithmetic number, because the mean of its divisors is an integer number (281289096).

Almost surely, 2^9842816665 is an apocalyptic number.

9842816665 is the 140305-th triangular number and also the 70153-rd hexagonal number.

9842816665 is the 46769-th centered nonagonal number.

It is an amenable number.

9842816665 is a deficient number, since it is larger than the sum of its proper divisors (3659059943).

9842816665 is a wasteful number, since it uses less digits than its factorization.

9842816665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2702 (or 2671 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 55.

The square root of 9842816665 is about 99210.9704871392. The cubic root of 9842816665 is about 2143.0869840439.

The spelling of 9842816665 in words is "nine billion, eight hundred forty-two million, eight hundred sixteen thousand, six hundred sixty-five".