261016635 has 16 divisors (see below), whose sum is σ = 455592960. Its totient is φ = 126553440.

The previous prime is 261016607. The next prime is 261016681. The reversal of 261016635 is 536610162.

It is not a de Polignac number, because 261016635 - 2⁶ = 261016571 is a prime.

It is an unprimeable number.

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, 790795 + ... + 791124.

It is an arithmetic number, because the mean of its divisors is an integer number (28474560).

Almost surely, 2^261016635 is an apocalyptic number.

261016635 is a deficient number, since it is larger than the sum of its proper divisors (194576325).

261016635 is a wasteful number, since it uses less digits than its factorization.

261016635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1581938.

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

The square root of 261016635 is about 16156.0092535255. The cubic root of 261016635 is about 639.0812296784.

Adding to 261016635 its reverse (536610162), we get a palindrome (797626797).

The spelling of 261016635 in words is "two hundred sixty-one million, sixteen thousand, six hundred thirty-five".