266137456405 has 4 divisors (see below), whose sum is σ = 319364947692. Its totient is φ = 212909965120.

The previous prime is 266137456379. The next prime is 266137456493. The reversal of 266137456405 is 504654731662.

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 27346906161 + 238790550244 = 165369^2 + 488662^2 .

It is not a de Polignac number, because 266137456405 - 2²¹ = 266135359253 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26613745636 + ... + 26613745645.

It is an arithmetic number, because the mean of its divisors is an integer number (79841236923).

Almost surely, 2^266137456405 is an apocalyptic number.

It is an amenable number.

266137456405 is a deficient number, since it is larger than the sum of its proper divisors (53227491287).

266137456405 is an equidigital number, since it uses as much as digits as its factorization.

266137456405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53227491286.

The product of its (nonzero) digits is 3628800, while the sum is 49.

The spelling of 266137456405 in words is "two hundred sixty-six billion, one hundred thirty-seven million, four hundred fifty-six thousand, four hundred five".