2065995561 has 8 divisors (see below), whose sum is σ = 3148183744. Its totient is φ = 1180568880.

The previous prime is 2065995521. The next prime is 2065995593. The reversal of 2065995561 is 1655995602.

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

It is not a de Polignac number, because 2065995561 - 2¹³ = 2065987369 is a prime.

It is a super-3 number, since 3×2065995561³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2065995561.

It is not an unprimeable number, because it can be changed into a prime (2065995511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49190350 + ... + 49190391.

It is an arithmetic number, because the mean of its divisors is an integer number (393522968).

Almost surely, 2^2065995561 is an apocalyptic number.

2065995561 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2065995561 is a deficient number, since it is larger than the sum of its proper divisors (1082188183).

2065995561 is an equidigital number, since it uses as much as digits as its factorization.

2065995561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98380751.

The product of its (nonzero) digits is 729000, while the sum is 48.

The square root of 2065995561 is about 45453.2238790605. The cubic root of 2065995561 is about 1273.6295537108.

The spelling of 2065995561 in words is "two billion, sixty-five million, nine hundred ninety-five thousand, five hundred sixty-one".