16654918407921 has 40 divisors (see below), whose sum is σ = 25354976789120. Its totient is φ = 10892904134112.

The previous prime is 16654918407917. The next prime is 16654918407937. The reversal of 16654918407921 is 12970481945661.

16654918407921 is a `hidden beast` number, since 1 + 6 + 6 + 54 + 91 + 8 + 407 + 92 + 1 = 666.

It is not a de Polignac number, because 16654918407921 - 2² = 16654918407917 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16654918407121) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 7284331 + ... + 9293616.

It is an arithmetic number, because the mean of its divisors is an integer number (633874419728).

Almost surely, 2^{16654918407921} is an apocalyptic number.

It is an amenable number.

16654918407921 is a deficient number, since it is larger than the sum of its proper divisors (8700058381199).

16654918407921 is a wasteful number, since it uses less digits than its factorization.

16654918407921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16578195 (or 16578186 counting only the distinct ones).

The product of its (nonzero) digits is 26127360, while the sum is 63.

The spelling of 16654918407921 in words is "sixteen trillion, six hundred fifty-four billion, nine hundred eighteen million, four hundred seven thousand, nine hundred twenty-one".