266531601 has 16 divisors (see below), whose sum is σ = 427520000. Its totient is φ = 144287568.

The previous prime is 266531599. The next prime is 266531669. The reversal of 266531601 is 106135662.

It is not a de Polignac number, because 266531601 - 2¹ = 266531599 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (266533601) 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, 333601 + ... + 334398.

It is an arithmetic number, because the mean of its divisors is an integer number (26720000).

Almost surely, 2^266531601 is an apocalyptic number.

266531601 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

266531601 is a deficient number, since it is larger than the sum of its proper divisors (160988399).

266531601 is a wasteful number, since it uses less digits than its factorization.

266531601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 668028.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 266531601 is about 16325.7955702012. The cubic root of 266531601 is about 643.5509009954.

The spelling of 266531601 in words is "two hundred sixty-six million, five hundred thirty-one thousand, six hundred one".