3864671781806 has 32 divisors (see below), whose sum is σ = 6345232298496. Its totient is φ = 1750778656000.

The previous prime is 3864671781799. The next prime is 3864671781811. The reversal of 3864671781806 is 6081871764683.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14867291 + ... + 15125001.

It is an arithmetic number, because the mean of its divisors is an integer number (198288509328).

Almost surely, 2^{3864671781806} is an apocalyptic number.

3864671781806 is a deficient number, since it is larger than the sum of its proper divisors (2480560516690).

3864671781806 is a wasteful number, since it uses less digits than its factorization.

3864671781806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260008.

The product of its (nonzero) digits is 65028096, while the sum is 65.

The spelling of 3864671781806 in words is "three trillion, eight hundred sixty-four billion, six hundred seventy-one million, seven hundred eighty-one thousand, eight hundred six".