2665766151649 has 2 divisors, whose sum is σ = 2665766151650. Its totient is φ = 2665766151648.

The previous prime is 2665766151647. The next prime is 2665766151661. The reversal of 2665766151649 is 9461516675662.

2665766151649 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1697769910225 + 967996241424 = 1302985^2 + 983868^2 .

It is a cyclic number.

It is not a de Polignac number, because 2665766151649 - 2¹ = 2665766151647 is a prime.

Together with 2665766151647, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (2665766151647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1332883075824 + 1332883075825.

It is an arithmetic number, because the mean of its divisors is an integer number (1332883075825).

Almost surely, 2^{2665766151649} is an apocalyptic number.

It is an amenable number.

2665766151649 is a deficient number, since it is larger than the sum of its proper divisors (1).

2665766151649 is an equidigital number, since it uses as much as digits as its factorization.

2665766151649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 97977600, while the sum is 64.

The spelling of 2665766151649 in words is "two trillion, six hundred sixty-five billion, seven hundred sixty-six million, one hundred fifty-one thousand, six hundred forty-nine".