6661375566100 has 18 divisors (see below), whose sum is σ = 14455184978654. Its totient is φ = 2664550226400.

The previous prime is 6661375566029. The next prime is 6661375566107. The reversal of 6661375566100 is 16655731666.

It can be written as a sum of positive squares in 3 ways, for example, as 27021441924 + 6634354124176 = 164382^2 + 2575724^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6661375566107) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 33306877731 + ... + 33306877930.

Almost surely, 2^{6661375566100} is an apocalyptic number.

It is an amenable number.

6661375566100 is an abundant number, since it is smaller than the sum of its proper divisors (7793809412554).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6661375566100 is a wasteful number, since it uses less digits than its factorization.

6661375566100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66613755675 (or 66613755668 counting only the distinct ones).

The product of its (nonzero) digits is 4082400, while the sum is 52.

The spelling of 6661375566100 in words is "six trillion, six hundred sixty-one billion, three hundred seventy-five million, five hundred sixty-six thousand, one hundred".