261651336 has 32 divisors (see below), whose sum is σ = 656631360. Its totient is φ = 86883392.

The previous prime is 261651331. The next prime is 261651343. The reversal of 261651336 is 633156162.

It is a super-2 number, since 2×261651336² = 136922843261169792, which contains 22 as substring.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 261651297 and 261651306.

It is not an unprimeable number, because it can be changed into a prime (261651331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14415 + ... + 27038.

It is an arithmetic number, because the mean of its divisors is an integer number (20519730).

Almost surely, 2^261651336 is an apocalyptic number.

It is an amenable number.

261651336 is an abundant number, since it is smaller than the sum of its proper divisors (394980024).

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

261651336 is a wasteful number, since it uses less digits than its factorization.

261651336 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41725 (or 41721 counting only the distinct ones).

The product of its digits is 19440, while the sum is 33.

The square root of 261651336 is about 16175.6402037137. The cubic root of 261651336 is about 639.5988175828.

The spelling of 261651336 in words is "two hundred sixty-one million, six hundred fifty-one thousand, three hundred thirty-six".