212726655761 has 2 divisors, whose sum is σ = 212726655762. Its totient is φ = 212726655760.

The previous prime is 212726655677. The next prime is 212726655863. The reversal of 212726655761 is 167556627212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 174210238225 + 38516417536 = 417385^2 + 196256^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212726655761 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (212726655461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106363327880 + 106363327881.

It is an arithmetic number, because the mean of its divisors is an integer number (106363327881).

Almost surely, 2^212726655761 is an apocalyptic number.

It is an amenable number.

212726655761 is a deficient number, since it is larger than the sum of its proper divisors (1).

212726655761 is an equidigital number, since it uses as much as digits as its factorization.

212726655761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2116800, while the sum is 50.

The spelling of 212726655761 in words is "two hundred twelve billion, seven hundred twenty-six million, six hundred fifty-five thousand, seven hundred sixty-one".