1666683353700 has 90 divisors (see below), whose sum is σ = 5402729016146. Its totient is φ = 444448892160.

The previous prime is 1666683353693. The next prime is 1666683353723. The reversal of 1666683353700 is 73533866661.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 2939374656 + 1663743979044 = 54216^2 + 1289862^2 .

It is a tau number, because it is divible by the number of its divisors (90).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 102873589 + ... + 102889788.

Almost surely, 2^{1666683353700} is an apocalyptic number.

1666683353700 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1666683353700 is an abundant number, since it is smaller than the sum of its proper divisors (3736045662446).

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

1666683353700 is a wasteful number, since it uses less digits than its factorization.

1666683353700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205763403 (or 205763387 counting only the distinct ones).

The product of its (nonzero) digits is 9797760, while the sum is 54.

The spelling of 1666683353700 in words is "one trillion, six hundred sixty-six billion, six hundred eighty-three million, three hundred fifty-three thousand, seven hundred".