1666768049955 has 48 divisors (see below), whose sum is σ = 3015868227840. Its totient is φ = 849957033024.

The previous prime is 1666768049911. The next prime is 1666768049977. The reversal of 1666768049955 is 5599408676661.

It is not a de Polignac number, because 1666768049955 - 2¹⁰ = 1666768048931 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2310732 + ... + 2944998.

It is an arithmetic number, because the mean of its divisors is an integer number (62830588080).

Almost surely, 2^{1666768049955} is an apocalyptic number.

1666768049955 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1666768049955 is a deficient number, since it is larger than the sum of its proper divisors (1349100177885).

1666768049955 is a wasteful number, since it uses less digits than its factorization.

1666768049955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636840 (or 636837 counting only the distinct ones).

The product of its (nonzero) digits is 587865600, while the sum is 72.

The spelling of 1666768049955 in words is "one trillion, six hundred sixty-six billion, seven hundred sixty-eight million, forty-nine thousand, nine hundred fifty-five".