266105665 has 16 divisors (see below), whose sum is σ = 374810112. Its totient is φ = 177539904.

The previous prime is 266105627. The next prime is 266105689. The reversal of 266105665 is 566501662.

It is a cyclic number.

It is not a de Polignac number, because 266105665 - 2¹⁹ = 265581377 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 101449 + ... + 104038.

It is an arithmetic number, because the mean of its divisors is an integer number (23425632).

Almost surely, 2^266105665 is an apocalyptic number.

It is an amenable number.

266105665 is a deficient number, since it is larger than the sum of its proper divisors (108704447).

266105665 is a wasteful number, since it uses less digits than its factorization.

266105665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205536.

The product of its (nonzero) digits is 64800, while the sum is 37.

The square root of 266105665 is about 16312.7454770802. The cubic root of 266105665 is about 643.2079052159.

The spelling of 266105665 in words is "two hundred sixty-six million, one hundred five thousand, six hundred sixty-five".