9181664042 has 8 divisors (see below), whose sum is σ = 13773286596. Its totient is φ = 4590568512.

The previous prime is 9181664029. The next prime is 9181664059. The reversal of 9181664042 is 2404661819.

It is a Cunningham number, because it is equal to 95821²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 9181664041 + 1 = 95821^2 + 1^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84863 + ... + 159890.

Almost surely, 2^9181664042 is an apocalyptic number.

9181664042 is a deficient number, since it is larger than the sum of its proper divisors (4591622554).

9181664042 is a wasteful number, since it uses less digits than its factorization.

9181664042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263512.

The product of its (nonzero) digits is 82944, while the sum is 41.

The square root of 9181664042 is about 95821.0000052181. Note that the first 5 decimals coincide. The cubic root of 9181664042 is about 2093.9861231443.

The spelling of 9181664042 in words is "nine billion, one hundred eighty-one million, six hundred sixty-four thousand, forty-two".