4006180556681 has 4 divisors (see below), whose sum is σ = 4007145208212. Its totient is φ = 4005215905152.

The previous prime is 4006180556671. The next prime is 4006180556699. The reversal of 4006180556681 is 1866550816004.

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 1619279155081 + 2386901401600 = 1272509^2 + 1544960^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4006180556681 is a prime.

It is a super-2 number, since 2×4006180556681² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (4006180556621) 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, 482319536 + ... + 482327841.

It is an arithmetic number, because the mean of its divisors is an integer number (1001786302053).

Almost surely, 2^{4006180556681} is an apocalyptic number.

It is an amenable number.

4006180556681 is a deficient number, since it is larger than the sum of its proper divisors (964651531).

4006180556681 is an equidigital number, since it uses as much as digits as its factorization.

4006180556681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 964651530.

The product of its (nonzero) digits is 1382400, while the sum is 50.

The spelling of 4006180556681 in words is "four trillion, six billion, one hundred eighty million, five hundred fifty-six thousand, six hundred eighty-one".