261633026 has 32 divisors (see below), whose sum is σ = 426870000. Its totient is φ = 119808000.

The previous prime is 261633011. The next prime is 261633079. The reversal of 261633026 is 620336162.

It can be written as a sum of positive squares in 8 ways, for example, as 155027401 + 106605625 = 12451^2 + 10325^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 261633026.

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 15 ways as a sum of consecutive naturals, for example, 208850 + ... + 210098.

Almost surely, 2^261633026 is an apocalyptic number.

261633026 is a deficient number, since it is larger than the sum of its proper divisors (165236974).

261633026 is a wasteful number, since it uses less digits than its factorization.

261633026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1430.

The product of its (nonzero) digits is 7776, while the sum is 29.

The square root of 261633026 is about 16175.0742193042. The cubic root of 261633026 is about 639.5838978201.

Adding to 261633026 its reverse (620336162), we get a palindrome (881969188).

The spelling of 261633026 in words is "two hundred sixty-one million, six hundred thirty-three thousand, twenty-six".