266401365 has 16 divisors (see below), whose sum is σ = 431379648. Its totient is φ = 140368256.

The previous prime is 266401361. The next prime is 266401381. The reversal of 266401365 is 563104662.

It is a cyclic number.

It is not a de Polignac number, because 266401365 - 2² = 266401361 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266401361) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 105744 + ... + 108233.

It is an arithmetic number, because the mean of its divisors is an integer number (26961228).

Almost surely, 2^266401365 is an apocalyptic number.

It is an amenable number.

266401365 is a deficient number, since it is larger than the sum of its proper divisors (164978283).

266401365 is a wasteful number, since it uses less digits than its factorization.

266401365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214068.

The product of its (nonzero) digits is 25920, while the sum is 33.

The square root of 266401365 is about 16321.8064257606. The cubic root of 266401365 is about 643.4460639581.

The spelling of 266401365 in words is "two hundred sixty-six million, four hundred one thousand, three hundred sixty-five".