266055289501 has 2 divisors, whose sum is σ = 266055289502. Its totient is φ = 266055289500.

The previous prime is 266055289471. The next prime is 266055289547. The reversal of 266055289501 is 105982550662.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 262401087001 + 3654202500 = 512251^2 + 60450^2 .

It is a cyclic number.

It is not a de Polignac number, because 266055289501 - 2⁵ = 266055289469 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266055289561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133027644750 + 133027644751.

It is an arithmetic number, because the mean of its divisors is an integer number (133027644751).

Almost surely, 2^266055289501 is an apocalyptic number.

It is an amenable number.

266055289501 is a deficient number, since it is larger than the sum of its proper divisors (1).

266055289501 is an equidigital number, since it uses as much as digits as its factorization.

266055289501 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296000, while the sum is 49.

The spelling of 266055289501 in words is "two hundred sixty-six billion, fifty-five million, two hundred eighty-nine thousand, five hundred one".