266513121556 has 24 divisors (see below), whose sum is σ = 519623266176. Its totient is φ = 118564830720.

The previous prime is 266513121547. The next prime is 266513121571. The reversal of 266513121556 is 655121315662.

It is a happy number.

266513121556 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×266513121556² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64435341 + ... + 64439476.

It is an arithmetic number, because the mean of its divisors is an integer number (21650969424).

Almost surely, 2^266513121556 is an apocalyptic number.

It is an amenable number.

266513121556 is a deficient number, since it is larger than the sum of its proper divisors (253110144620).

266513121556 is a wasteful number, since it uses less digits than its factorization.

266513121556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128874879 (or 128874877 counting only the distinct ones).

The product of its digits is 324000, while the sum is 43.

The spelling of 266513121556 in words is "two hundred sixty-six billion, five hundred thirteen million, one hundred twenty-one thousand, five hundred fifty-six".