266142126065405 has 4 divisors (see below), whose sum is σ = 319370551278492. Its totient is φ = 212913700852320.

The previous prime is 266142126065357. The next prime is 266142126065483. The reversal of 266142126065405 is 504560621241662.

266142126065405 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 103069174985401 + 163072951080004 = 10152299^2 + 12770002^2 .

It is a de Polignac number, because none of the positive numbers 2^k-266142126065405 is a prime.

It is a super-2 number, since 2×266142126065405² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26614212606536 + ... + 26614212606545.

It is an arithmetic number, because the mean of its divisors is an integer number (79842637819623).

Almost surely, 2^{266142126065405} is an apocalyptic number.

It is an amenable number.

266142126065405 is a deficient number, since it is larger than the sum of its proper divisors (53228425213087).

266142126065405 is an equidigital number, since it uses as much as digits as its factorization.

266142126065405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53228425213086.

The product of its (nonzero) digits is 4147200, while the sum is 50.

The spelling of 266142126065405 in words is "two hundred sixty-six trillion, one hundred forty-two billion, one hundred twenty-six million, sixty-five thousand, four hundred five".