3213885143666 has 4 divisors (see below), whose sum is σ = 4820827715502. Its totient is φ = 1606942571832.

The previous prime is 3213885143657. The next prime is 3213885143681. The reversal of 3213885143666 is 6663415883123.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 3201111397225 + 12773746441 = 1789165^2 + 113021^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 803471285915 + ... + 803471285918.

Almost surely, 2^{3213885143666} is an apocalyptic number.

3213885143666 is a deficient number, since it is larger than the sum of its proper divisors (1606942571836).

3213885143666 is a wasteful number, since it uses less digits than its factorization.

3213885143666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1606942571835.

The product of its digits is 14929920, while the sum is 56.

The spelling of 3213885143666 in words is "three trillion, two hundred thirteen billion, eight hundred eighty-five million, one hundred forty-three thousand, six hundred sixty-six".