2081366649 has 6 divisors (see below), whose sum is σ = 3006418506. Its totient is φ = 1387577760.

The previous prime is 2081366641. The next prime is 2081366689. The reversal of 2081366649 is 9466631802.

It can be written as a sum of positive squares in only one way, i.e., 1577678400 + 503688249 = 39720^2 + 22443^2 .

It is not a de Polignac number, because 2081366649 - 2³ = 2081366641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2081366641) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 115631472 + ... + 115631489.

It is an arithmetic number, because the mean of its divisors is an integer number (501069751).

Almost surely, 2^2081366649 is an apocalyptic number.

It is an amenable number.

2081366649 is a deficient number, since it is larger than the sum of its proper divisors (925051857).

2081366649 is a wasteful number, since it uses less digits than its factorization.

2081366649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 231262967 (or 231262964 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 45.

The square root of 2081366649 is about 45621.9974244881. The cubic root of 2081366649 is about 1276.7803704589.

The spelling of 2081366649 in words is "two billion, eighty-one million, three hundred sixty-six thousand, six hundred forty-nine".