126665 has 24 divisors (see below), whose sum is σ = 196992. Its totient is φ = 77280.

The previous prime is 126653. The next prime is 126683. The reversal of 126665 is 566621.

126665 = T₄₆ + T₄₇ + ... + T₉₄.

It is not a de Polignac number, because 126665 - 2⁶ = 126601 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2672 + ... + 2718.

It is an arithmetic number, because the mean of its divisors is an integer number (8208).

2¹²⁶⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

126665 is a deficient number, since it is larger than the sum of its proper divisors (70327).

126665 is a wasteful number, since it uses less digits than its factorization.

126665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77 (or 70 counting only the distinct ones).

The product of its digits is 2160, while the sum is 26.

The square root of 126665 is about 355.9002669288. The cubic root of 126665 is about 50.2210215499.

It can be divided in two parts, 1266 and 65, that added together give a palindrome (1331).

The spelling of 126665 in words is "one hundred twenty-six thousand, six hundred sixty-five".