4000649033581 has 4 divisors (see below), whose sum is σ = 4235981329692. Its totient is φ = 3765316737472.

The previous prime is 4000649033573. The next prime is 4000649033603. The reversal of 4000649033581 is 1853309460004.

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 2244138822025 + 1756510211556 = 1498045^2 + 1325334^2 .

It is a cyclic number.

It is not a de Polignac number, because 4000649033581 - 2³ = 4000649033573 is a prime.

It is a super-2 number, since 2×4000649033581² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4000649033501) 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, 117666148030 + ... + 117666148063.

It is an arithmetic number, because the mean of its divisors is an integer number (1058995332423).

Almost surely, 2^{4000649033581} is an apocalyptic number.

It is an amenable number.

4000649033581 is a deficient number, since it is larger than the sum of its proper divisors (235332296111).

4000649033581 is a wasteful number, since it uses less digits than its factorization.

4000649033581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235332296110.

The product of its (nonzero) digits is 311040, while the sum is 43.

The spelling of 4000649033581 in words is "four trillion, six hundred forty-nine million, thirty-three thousand, five hundred eighty-one".