261504016 has 20 divisors (see below), whose sum is σ = 507302352. Its totient is φ = 130587296.

The previous prime is 261503993. The next prime is 261504029. The reversal of 261504016 is 610405162.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3351 + ... + 23113.

Almost surely, 2^261504016 is an apocalyptic number.

It is an amenable number.

261504016 is a deficient number, since it is larger than the sum of its proper divisors (245798336).

261504016 is a wasteful number, since it uses less digits than its factorization.

261504016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20598 (or 20592 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 261504016 is about 16171.0858015162. The cubic root of 261504016 is about 639.4787552777.

Adding to 261504016 its reverse (610405162), we get a palindrome (871909178).

The spelling of 261504016 in words is "two hundred sixty-one million, five hundred four thousand, sixteen".