1666610550016 has 18 divisors (see below), whose sum is σ = 3326710903082. Its totient is φ = 833305274880.

The previous prime is 1666610550001. The next prime is 1666610550029. The reversal of 1666610550016 is 6100550166661.

It can be written as a sum of positive squares in only one way, i.e., 1571312390400 + 95298159616 = 1253520^2 + 308704^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3255098475 + ... + 3255098986.

Almost surely, 2^{1666610550016} is an apocalyptic number.

1666610550016 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1666610550016 is a deficient number, since it is larger than the sum of its proper divisors (1660100353066).

1666610550016 is an frugal number, since it uses more digits than its factorization.

1666610550016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6510197477 (or 6510197463 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 43.

The spelling of 1666610550016 in words is "one trillion, six hundred sixty-six billion, six hundred ten million, five hundred fifty thousand, sixteen".