2097761777 has 4 divisors (see below), whose sum is σ = 2170098420. Its totient is φ = 2025425136.

The previous prime is 2097761749. The next prime is 2097761779. The reversal of 2097761777 is 7771677902.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7771677902 = 2 ⋅3885838951.

It can be written as a sum of positive squares in 2 ways, for example, as 437688241 + 1660073536 = 20921^2 + 40744^2 .

It is a cyclic number.

It is not a de Polignac number, because 2097761777 - 2¹⁴ = 2097745393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2097761779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36168278 + ... + 36168335.

It is an arithmetic number, because the mean of its divisors is an integer number (542524605).

Almost surely, 2^2097761777 is an apocalyptic number.

It is an amenable number.

2097761777 is a deficient number, since it is larger than the sum of its proper divisors (72336643).

2097761777 is an equidigital number, since it uses as much as digits as its factorization.

2097761777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72336642.

The product of its (nonzero) digits is 1815156, while the sum is 53.

The square root of 2097761777 is about 45801.3294239370. The cubic root of 2097761777 is about 1280.1240474262.

The spelling of 2097761777 in words is "two billion, ninety-seven million, seven hundred sixty-one thousand, seven hundred seventy-seven".