126666660655 has 16 divisors (see below), whose sum is σ = 154305476064. Its totient is φ = 99800363520.

The previous prime is 126666660649. The next prime is 126666660667. The reversal of 126666660655 is 556066666621.

It is not a de Polignac number, because 126666660655 - 2¹¹ = 126666658607 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 126666660596 and 126666660605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1107 + ... + 503323.

It is an arithmetic number, because the mean of its divisors is an integer number (9644092254).

Almost surely, 2^126666660655 is an apocalyptic number.

126666660655 is a deficient number, since it is larger than the sum of its proper divisors (27638815409).

126666660655 is an equidigital number, since it uses as much as digits as its factorization.

126666660655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 502986.

The product of its (nonzero) digits is 13996800, while the sum is 55.

The spelling of 126666660655 in words is "one hundred twenty-six billion, six hundred sixty-six million, six hundred sixty thousand, six hundred fifty-five".