6661608094421 has 16 divisors (see below), whose sum is σ = 7953540661248. Its totient is φ = 5459182455600.

The previous prime is 6661608094399. The next prime is 6661608094423. The reversal of 6661608094421 is 1244908061666.

It is a cyclic number.

It is not a de Polignac number, because 6661608094421 - 2⁶ = 6661608094357 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6661608094423) 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, 184913645 + ... + 184949666.

It is an arithmetic number, because the mean of its divisors is an integer number (497096291328).

Almost surely, 2^{6661608094421} is an apocalyptic number.

It is an amenable number.

6661608094421 is a deficient number, since it is larger than the sum of its proper divisors (1291932566827).

6661608094421 is a wasteful number, since it uses less digits than its factorization.

6661608094421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369863432.

The product of its (nonzero) digits is 2985984, while the sum is 53.

The spelling of 6661608094421 in words is "six trillion, six hundred sixty-one billion, six hundred eight million, ninety-four thousand, four hundred twenty-one".