2775730261921 has 2 divisors, whose sum is σ = 2775730261922. Its totient is φ = 2775730261920.

The previous prime is 2775730261873. The next prime is 2775730262003. The reversal of 2775730261921 is 1291620375772.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2607659780625 + 168070481296 = 1614825^2 + 409964^2 .

It is a cyclic number.

It is not a de Polignac number, because 2775730261921 - 2³⁷ = 2638291308449 is a prime.

It is a super-2 number, since 2×2775730261921² (a number of 26 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2775730265921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1387865130960 + 1387865130961.

It is an arithmetic number, because the mean of its divisors is an integer number (1387865130961).

Almost surely, 2^{2775730261921} is an apocalyptic number.

It is an amenable number.

2775730261921 is a deficient number, since it is larger than the sum of its proper divisors (1).

2775730261921 is an equidigital number, since it uses as much as digits as its factorization.

2775730261921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2222640, while the sum is 52.

The spelling of 2775730261921 in words is "two trillion, seven hundred seventy-five billion, seven hundred thirty million, two hundred sixty-one thousand, nine hundred twenty-one".