2811888737261 has 2 divisors, whose sum is σ = 2811888737262. Its totient is φ = 2811888737260.

The previous prime is 2811888737257. The next prime is 2811888737303. The reversal of 2811888737261 is 1627378881182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2528751942025 + 283136795236 = 1590205^2 + 532106^2 .

It is a cyclic number.

It is not a de Polignac number, because 2811888737261 - 2² = 2811888737257 is a prime.

It is a super-2 number, since 2×2811888737261² (a number of 26 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2811888737194 and 2811888737203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2811888737221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1405944368630 + 1405944368631.

It is an arithmetic number, because the mean of its divisors is an integer number (1405944368631).

Almost surely, 2^{2811888737261} is an apocalyptic number.

It is an amenable number.

2811888737261 is a deficient number, since it is larger than the sum of its proper divisors (1).

2811888737261 is an equidigital number, since it uses as much as digits as its factorization.

2811888737261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14450688, while the sum is 62.

The spelling of 2811888737261 in words is "two trillion, eight hundred eleven billion, eight hundred eighty-eight million, seven hundred thirty-seven thousand, two hundred sixty-one".