261633512 has 32 divisors (see below), whose sum is σ = 575800320. Its totient is φ = 109097280.

The previous prime is 261633503. The next prime is 261633527. The reversal of 261633512 is 215336162.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61064 + ... + 65207.

It is an arithmetic number, because the mean of its divisors is an integer number (17993760).

Almost surely, 2^261633512 is an apocalyptic number.

It is an amenable number.

261633512 is an abundant number, since it is smaller than the sum of its proper divisors (314166808).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261633512 is a wasteful number, since it uses less digits than its factorization.

261633512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126321 (or 126317 counting only the distinct ones).

The product of its digits is 6480, while the sum is 29.

The square root of 261633512 is about 16175.0892424122. The cubic root of 261633512 is about 639.5842938424.

Adding to 261633512 its reverse (215336162), we get a palindrome (476969674).

The spelling of 261633512 in words is "two hundred sixty-one million, six hundred thirty-three thousand, five hundred twelve".