1262255805661 has 2 divisors, whose sum is σ = 1262255805662. Its totient is φ = 1262255805660.

The previous prime is 1262255805617. The next prime is 1262255805667. The reversal of 1262255805661 is 1665085522621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1255822803225 + 6433002436 = 1120635^2 + 80206^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1262255805661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1262255805667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 631127902830 + 631127902831.

It is an arithmetic number, because the mean of its divisors is an integer number (631127902831).

Almost surely, 2^{1262255805661} is an apocalyptic number.

It is an amenable number.

1262255805661 is a deficient number, since it is larger than the sum of its proper divisors (1).

1262255805661 is an equidigital number, since it uses as much as digits as its factorization.

1262255805661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728000, while the sum is 49.

The spelling of 1262255805661 in words is "one trillion, two hundred sixty-two billion, two hundred fifty-five million, eight hundred five thousand, six hundred sixty-one".