6661267565040 has 320 divisors, whose sum is σ = 25502490593280. Its totient is φ = 1584383523840.

The previous prime is 6661267564967. The next prime is 6661267565083. The reversal of 6661267565040 is 405657621666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1385592 + ... + 3904151.

It is an arithmetic number, because the mean of its divisors is an integer number (79695283104).

Almost surely, 2^{6661267565040} is an apocalyptic number.

6661267565040 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6661267565040 is an abundant number, since it is smaller than the sum of its proper divisors (18841223028240).

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

6661267565040 is a wasteful number, since it uses less digits than its factorization.

6661267565040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5289829 (or 5289817 counting only the distinct ones).

The product of its (nonzero) digits is 10886400, while the sum is 54.

The spelling of 6661267565040 in words is "six trillion, six hundred sixty-one billion, two hundred sixty-seven million, five hundred sixty-five thousand, forty".