2006537861 has 8 divisors (see below), whose sum is σ = 2061466104. Its totient is φ = 1951646400.

The previous prime is 2006537849. The next prime is 2006537881. The reversal of 2006537861 is 1687356002.

It can be written as a sum of positive squares in 4 ways, for example, as 910530625 + 1096007236 = 30175^2 + 33106^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2006537861 - 2¹⁴ = 2006521477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2006537801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129611 + ... + 144263.

It is an arithmetic number, because the mean of its divisors is an integer number (257683263).

Almost surely, 2^2006537861 is an apocalyptic number.

It is an amenable number.

2006537861 is a deficient number, since it is larger than the sum of its proper divisors (54928243).

2006537861 is a wasteful number, since it uses less digits than its factorization.

2006537861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18391.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 2006537861 is about 44794.3954195165. The cubic root of 2006537861 is about 1261.2924214550.

The spelling of 2006537861 in words is "two billion, six million, five hundred thirty-seven thousand, eight hundred sixty-one".