2666660512540 has 12 divisors (see below), whose sum is σ = 5599987076376. Its totient is φ = 1066664205008.

The previous prime is 2666660512531. The next prime is 2666660512543. The reversal of 2666660512540 is 452150666662.

It is a super-2 number, since 2×2666660512540² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2666660512543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66666512794 + ... + 66666512833.

It is an arithmetic number, because the mean of its divisors is an integer number (466665589698).

Almost surely, 2^{2666660512540} is an apocalyptic number.

2666660512540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2666660512540 is an abundant number, since it is smaller than the sum of its proper divisors (2933326563836).

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

2666660512540 is a wasteful number, since it uses less digits than its factorization.

2666660512540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133333025636 (or 133333025634 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 49.

The spelling of 2666660512540 in words is "two trillion, six hundred sixty-six billion, six hundred sixty million, five hundred twelve thousand, five hundred forty".