261695568 has 40 divisors (see below), whose sum is σ = 686145568. Its totient is φ = 85928832.

The previous prime is 261695557. The next prime is 261695611. The reversal of 261695568 is 865596162.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

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, 37471 + ... + 43902.

Almost surely, 2^261695568 is an apocalyptic number.

It is an amenable number.

261695568 is an abundant number, since it is smaller than the sum of its proper divisors (424450000).

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

261695568 is a wasteful number, since it uses less digits than its factorization.

261695568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81451 (or 81445 counting only the distinct ones).

The product of its digits is 777600, while the sum is 48.

The square root of 261695568 is about 16177.0073870293. The cubic root of 261695568 is about 639.6348568164.

The spelling of 261695568 in words is "two hundred sixty-one million, six hundred ninety-five thousand, five hundred sixty-eight".