9666484381 has 4 divisors (see below), whose sum is σ = 9683473500. Its totient is φ = 9649495264.

The previous prime is 9666484379. The next prime is 9666484391. The reversal of 9666484381 is 1834846669.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1834846669 = 17 ⋅107932157.

It can be written as a sum of positive squares in 2 ways, for example, as 6413607225 + 3252877156 = 80085^2 + 57034^2 .

It is a cyclic number.

It is not a de Polignac number, because 9666484381 - 2¹ = 9666484379 is a prime.

It is a super-2 number, since 2×9666484381² (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 (9666484391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8493706 + ... + 8494843.

It is an arithmetic number, because the mean of its divisors is an integer number (2420868375).

Almost surely, 2^9666484381 is an apocalyptic number.

It is an amenable number.

9666484381 is a deficient number, since it is larger than the sum of its proper divisors (16989119).

9666484381 is a wasteful number, since it uses less digits than its factorization.

9666484381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16989118.

The product of its digits is 5971968, while the sum is 55.

The square root of 9666484381 is about 98318.2810112138. The cubic root of 9666484381 is about 2130.2121193969.

The spelling of 9666484381 in words is "nine billion, six hundred sixty-six million, four hundred eighty-four thousand, three hundred eighty-one".