2066542381 has 2 divisors, whose sum is σ = 2066542382. Its totient is φ = 2066542380.

The previous prime is 2066542343. The next prime is 2066542399. The reversal of 2066542381 is 1832456602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1458476100 + 608066281 = 38190^2 + 24659^2 .

It is a cyclic number.

It is not a de Polignac number, because 2066542381 - 2¹³ = 2066534189 is a prime.

It is a super-2 number, since 2×2066542381² = 8541194824938298322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2066542381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2066542081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1033271190 + 1033271191.

It is an arithmetic number, because the mean of its divisors is an integer number (1033271191).

Almost surely, 2^2066542381 is an apocalyptic number.

It is an amenable number.

2066542381 is a deficient number, since it is larger than the sum of its proper divisors (1).

2066542381 is an equidigital number, since it uses as much as digits as its factorization.

2066542381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69120, while the sum is 37.

The square root of 2066542381 is about 45459.2386759831. The cubic root of 2066542381 is about 1273.7419103054.

Adding to 2066542381 its reverse (1832456602), we get a palindrome (3898998983).

The spelling of 2066542381 in words is "two billion, sixty-six million, five hundred forty-two thousand, three hundred eighty-one".