340240021666 has 4 divisors (see below), whose sum is σ = 510360032502. Its totient is φ = 170120010832.

The previous prime is 340240021613. The next prime is 340240021721. The reversal of 340240021666 is 666120042043.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 666120042043 = 179 ⋅3721341017.

It can be written as a sum of positive squares in only one way, i.e., 196235710225 + 144004311441 = 442985^2 + 379479^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85060005415 + ... + 85060005418.

Almost surely, 2^340240021666 is an apocalyptic number.

340240021666 is a deficient number, since it is larger than the sum of its proper divisors (170120010836).

340240021666 is a wasteful number, since it uses less digits than its factorization.

340240021666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170120010835.

The product of its (nonzero) digits is 41472, while the sum is 34.

The spelling of 340240021666 in words is "three hundred forty billion, two hundred forty million, twenty-one thousand, six hundred sixty-six".