4006663426861 has 4 divisors (see below), whose sum is σ = 4242349510812. Its totient is φ = 3770977342912.

The previous prime is 4006663426853. The next prime is 4006663426891. The reversal of 4006663426861 is 1686243666004.

4006663426861 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3306236709636 + 700426717225 = 1818306^2 + 836915^2 .

It is a cyclic number.

It is not a de Polignac number, because 4006663426861 - 2³ = 4006663426853 is a prime.

It is a super-2 number, since 2×4006663426861² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4006663426799 and 4006663426808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4006663426811) 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, 117843041950 + ... + 117843041983.

It is an arithmetic number, because the mean of its divisors is an integer number (1060587377703).

Almost surely, 2^{4006663426861} is an apocalyptic number.

It is an amenable number.

4006663426861 is a deficient number, since it is larger than the sum of its proper divisors (235686083951).

4006663426861 is a wasteful number, since it uses less digits than its factorization.

4006663426861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235686083950.

The product of its (nonzero) digits is 5971968, while the sum is 52.

The spelling of 4006663426861 in words is "four trillion, six billion, six hundred sixty-three million, four hundred twenty-six thousand, eight hundred sixty-one".