661334265 has 48 divisors (see below), whose sum is σ = 1176411600. Its totient is φ = 343549440.

The previous prime is 661334237. The next prime is 661334269. The reversal of 661334265 is 562433166.

661334265 is a `hidden beast` number, since 6 + 61 + 334 + 265 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 181198521 + 480135744 = 13461^2 + 21912^2 .

It is not a de Polignac number, because 661334265 - 2⁷ = 661334137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (661334269) 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 47 ways as a sum of consecutive naturals, for example, 354435 + ... + 356295.

It is an arithmetic number, because the mean of its divisors is an integer number (24508575).

Almost surely, 2^661334265 is an apocalyptic number.

It is an amenable number.

661334265 is a deficient number, since it is larger than the sum of its proper divisors (515077335).

661334265 is a wasteful number, since it uses less digits than its factorization.

661334265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2074 (or 2071 counting only the distinct ones).

The product of its digits is 77760, while the sum is 36.

The square root of 661334265 is about 25716.4201435581. The cubic root of 661334265 is about 871.2450860727.

It can be divided in two parts, 66 and 1334265, that added together give a palindrome (1334331).

The spelling of 661334265 in words is "six hundred sixty-one million, three hundred thirty-four thousand, two hundred sixty-five".