265011611666 has 4 divisors (see below), whose sum is σ = 397517417502. Its totient is φ = 132505805832.

The previous prime is 265011611651. The next prime is 265011611779. The reversal of 265011611666 is 666116110562.

265011611666 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 189460843441 + 75550768225 = 435271^2 + 274865^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 66252902915 + ... + 66252902918.

Almost surely, 2^265011611666 is an apocalyptic number.

265011611666 is a deficient number, since it is larger than the sum of its proper divisors (132505805836).

265011611666 is a wasteful number, since it uses less digits than its factorization.

265011611666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132505805835.

The product of its (nonzero) digits is 77760, while the sum is 41.

The spelling of 265011611666 in words is "two hundred sixty-five billion, eleven million, six hundred eleven thousand, six hundred sixty-six".