1666701688682 has 8 divisors (see below), whose sum is σ = 2567621520516. Its totient is φ = 810827848512.

The previous prime is 1666701688681. The next prime is 1666701688733. The reversal of 1666701688682 is 2868861076661.

It can be written as a sum of positive squares in 2 ways, for example, as 1551217939441 + 115483749241 = 1245479^2 + 339829^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1666701688681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11261497823 + ... + 11261497970.

Almost surely, 2^{1666701688682} is an apocalyptic number.

1666701688682 is a deficient number, since it is larger than the sum of its proper divisors (900919831834).

1666701688682 is a wasteful number, since it uses less digits than its factorization.

1666701688682 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22522995832.

The product of its (nonzero) digits is 55738368, while the sum is 65.

The spelling of 1666701688682 in words is "one trillion, six hundred sixty-six billion, seven hundred one million, six hundred eighty-eight thousand, six hundred eighty-two".