4181663041921 has 16 divisors (see below), whose sum is σ = 4319255577600. Its totient is φ = 4044240244800.

The previous prime is 4181663041909. The next prime is 4181663041979. The reversal of 4181663041921 is 1291403661814.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4181663041921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4181663041981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 615762036 + ... + 615768826.

It is an arithmetic number, because the mean of its divisors is an integer number (269953473600).

Almost surely, 2^{4181663041921} is an apocalyptic number.

It is an amenable number.

4181663041921 is a deficient number, since it is larger than the sum of its proper divisors (137592535679).

4181663041921 is a wasteful number, since it uses less digits than its factorization.

4181663041921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16320.

The product of its (nonzero) digits is 248832, while the sum is 46.

The spelling of 4181663041921 in words is "four trillion, one hundred eighty-one billion, six hundred sixty-three million, forty-one thousand, nine hundred twenty-one".