1666868685170 has 32 divisors (see below), whose sum is σ = 3237509021040. Its totient is φ = 614250028800.

The previous prime is 1666868685101. The next prime is 1666868685173. The reversal of 1666868685170 is 715868686661.

It can be written as a sum of positive squares in 8 ways, for example, as 1211868520801 + 455000164369 = 1100849^2 + 674537^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1666868685170.

It is not an unprimeable number, because it can be changed into a prime (1666868685173) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12529181 + ... + 12661520.

Almost surely, 2^{1666868685170} is an apocalyptic number.

1666868685170 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1666868685170 is a deficient number, since it is larger than the sum of its proper divisors (1570640335870).

1666868685170 is a wasteful number, since it uses less digits than its factorization.

1666868685170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25191230.

The product of its (nonzero) digits is 139345920, while the sum is 68.

The spelling of 1666868685170 in words is "one trillion, six hundred sixty-six billion, eight hundred sixty-eight million, six hundred eighty-five thousand, one hundred seventy".