1666845163700 has 36 divisors (see below), whose sum is σ = 3617799156972. Its totient is φ = 666600710400.

The previous prime is 1666845163681. The next prime is 1666845163717. The reversal of 1666845163700 is 73615486661.

It can be written as a sum of positive squares in 6 ways, for example, as 104880117904 + 1561965045796 = 323852^2 + 1249786^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1228409 + ... + 2200608.

It is an arithmetic number, because the mean of its divisors is an integer number (100494421027).

Almost surely, 2^{1666845163700} is an apocalyptic number.

1666845163700 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1666845163700 is an abundant number, since it is smaller than the sum of its proper divisors (1950953993272).

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

1666845163700 is a wasteful number, since it uses less digits than its factorization.

1666845163700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3433892 (or 3433885 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 53.

The spelling of 1666845163700 in words is "one trillion, six hundred sixty-six billion, eight hundred forty-five million, one hundred sixty-three thousand, seven hundred".