266220134016623 has 4 divisors (see below), whose sum is σ = 270193568852760. Its totient is φ = 262246699180488.

The previous prime is 266220134016601. The next prime is 266220134016653. The reversal of 266220134016623 is 326610431022662.

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

It is a cyclic number.

It is not a de Polignac number, because 266220134016623 - 2¹⁸ = 266220133754479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266220134016653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1986717417968 + ... + 1986717418101.

It is an arithmetic number, because the mean of its divisors is an integer number (67548392213190).

Almost surely, 2^{266220134016623} is an apocalyptic number.

266220134016623 is a deficient number, since it is larger than the sum of its proper divisors (3973434836137).

266220134016623 is an equidigital number, since it uses as much as digits as its factorization.

266220134016623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3973434836136.

The product of its (nonzero) digits is 746496, while the sum is 44.

The spelling of 266220134016623 in words is "two hundred sixty-six trillion, two hundred twenty billion, one hundred thirty-four million, sixteen thousand, six hundred twenty-three".