266385767583661 has 16 divisors (see below), whose sum is σ = 307697782814208. Its totient is φ = 227923019251200.

The previous prime is 266385767583599. The next prime is 266385767583721. The reversal of 266385767583661 is 166385767583662.

It is a cyclic number.

It is not a de Polignac number, because 266385767583661 - 2⁹ = 266385767583149 is a prime.

It is a super-2 number, since 2×266385767583661² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266385767580661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73270321 + ... + 76819993.

It is an arithmetic number, because the mean of its divisors is an integer number (19231111425888).

Almost surely, 2^{266385767583661} is an apocalyptic number.

It is an amenable number.

266385767583661 is a deficient number, since it is larger than the sum of its proper divisors (41312015230547).

266385767583661 is a wasteful number, since it uses less digits than its factorization.

266385767583661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3951012.

The product of its digits is 10973491200, while the sum is 79.

Subtracting from 266385767583661 its reverse (166385767583662), we obtain a palindrome (99999999999999).

The spelling of 266385767583661 in words is "two hundred sixty-six trillion, three hundred eighty-five billion, seven hundred sixty-seven million, five hundred eighty-three thousand, six hundred sixty-one".