4206772821681 has 8 divisors (see below), whose sum is σ = 6232256032160. Its totient is φ = 2804515214436.

The previous prime is 4206772821679. The next prime is 4206772821761. The reversal of 4206772821681 is 1861282776024.

4206772821681 is a `hidden beast` number, since 4 + 206 + 77 + 282 + 16 + 81 = 666.

It is not a de Polignac number, because 4206772821681 - 2¹ = 4206772821679 is a prime.

It is a super-2 number, since 2×4206772821681² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4206772821631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77903200375 + ... + 77903200428.

It is an arithmetic number, because the mean of its divisors is an integer number (779032004020).

Almost surely, 2^{4206772821681} is an apocalyptic number.

It is an amenable number.

4206772821681 is a deficient number, since it is larger than the sum of its proper divisors (2025483210479).

4206772821681 is a wasteful number, since it uses less digits than its factorization.

4206772821681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155806400812 (or 155806400806 counting only the distinct ones).

The product of its (nonzero) digits is 3612672, while the sum is 54.

The spelling of 4206772821681 in words is "four trillion, two hundred six billion, seven hundred seventy-two million, eight hundred twenty-one thousand, six hundred eighty-one".