20666661016260 has 96 divisors (see below), whose sum is σ = 66876386330880. Its totient is φ = 4670731726848.

The previous prime is 20666661016231. The next prime is 20666661016291. The reversal of 20666661016260 is 6261016666602.

It is a happy number.

It is a super-2 number, since 2×20666661016260² (a number of 27 digits) contains 22 as substring.

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 31 ways as a sum of consecutive naturals, for example, 276402709 + ... + 276477468.

It is an arithmetic number, because the mean of its divisors is an integer number (696629024280).

Almost surely, 2^{20666661016260} is an apocalyptic number.

20666661016260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20666661016260 is an abundant number, since it is smaller than the sum of its proper divisors (46209725314620).

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

20666661016260 is a wasteful number, since it uses less digits than its factorization.

20666661016260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 552880285 (or 552880283 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 48.

The spelling of 20666661016260 in words is "twenty trillion, six hundred sixty-six billion, six hundred sixty-one million, sixteen thousand, two hundred sixty".