266161605625603 has 4 divisors (see below), whose sum is σ = 268745698884208. Its totient is φ = 263577512367000.

The previous prime is 266161605625571. The next prime is 266161605625609. The reversal of 266161605625603 is 306526506161662.

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 266161605625603 - 2⁵ = 266161605625571 is a prime.

It is a super-2 number, since 2×266161605625603² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (266161605625609) by changing a digit.

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, 1292046629148 + ... + 1292046629353.

It is an arithmetic number, because the mean of its divisors is an integer number (67186424721052).

Almost surely, 2^{266161605625603} is an apocalyptic number.

266161605625603 is a deficient number, since it is larger than the sum of its proper divisors (2584093258605).

266161605625603 is a wasteful number, since it uses less digits than its factorization.

266161605625603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2584093258604.

The product of its (nonzero) digits is 13996800, while the sum is 55.

The spelling of 266161605625603 in words is "two hundred sixty-six trillion, one hundred sixty-one billion, six hundred five million, six hundred twenty-five thousand, six hundred three".