2667640961 has 2 divisors, whose sum is σ = 2667640962. Its totient is φ = 2667640960.

The previous prime is 2667640957. The next prime is 2667640991. The reversal of 2667640961 is 1690467662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2656783936 + 10857025 = 51544^2 + 3295^2 .

It is a cyclic number.

It is not a de Polignac number, because 2667640961 - 2² = 2667640957 is a prime.

It is not a weakly prime, because it can be changed into another prime (2667640931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1333820480 + 1333820481.

It is an arithmetic number, because the mean of its divisors is an integer number (1333820481).

Almost surely, 2^2667640961 is an apocalyptic number.

It is an amenable number.

2667640961 is a deficient number, since it is larger than the sum of its proper divisors (1).

2667640961 is an equidigital number, since it uses as much as digits as its factorization.

2667640961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 653184, while the sum is 47.

The square root of 2667640961 is about 51649.2106522452. The cubic root of 2667640961 is about 1386.8914126277.

The spelling of 2667640961 in words is "two billion, six hundred sixty-seven million, six hundred forty thousand, nine hundred sixty-one".