2066631561 has 12 divisors (see below), whose sum is σ = 2988825840. Its totient is φ = 1376050680.

The previous prime is 2066631551. The next prime is 2066631563. The reversal of 2066631561 is 1651366602.

It is not a de Polignac number, because 2066631561 - 2¹⁷ = 2066500489 is a prime.

It is a super-4 number, since 4×2066631561⁴ (a number of 38 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (2066631563) 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 11 ways as a sum of consecutive naturals, for example, 134271 + ... + 148868.

It is an arithmetic number, because the mean of its divisors is an integer number (249068820).

Almost surely, 2^2066631561 is an apocalyptic number.

It is an amenable number.

2066631561 is a deficient number, since it is larger than the sum of its proper divisors (922194279).

2066631561 is a wasteful number, since it uses less digits than its factorization.

2066631561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283956 (or 283953 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 2066631561 is about 45460.2195441245. The cubic root of 2066631561 is about 1273.7602324830.

The spelling of 2066631561 in words is "two billion, sixty-six million, six hundred thirty-one thousand, five hundred sixty-one".