261617552 has 20 divisors (see below), whose sum is σ = 579296256. Its totient is φ = 112121760.

The previous prime is 261617533. The next prime is 261617561. The reversal of 261617552 is 255716162.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1167824 + ... + 1168047.

Almost surely, 2^261617552 is an apocalyptic number.

It is an amenable number.

261617552 is an abundant number, since it is smaller than the sum of its proper divisors (317678704).

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

261617552 is a wasteful number, since it uses less digits than its factorization.

261617552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2335886 (or 2335880 counting only the distinct ones).

The product of its digits is 25200, while the sum is 35.

The square root of 261617552 is about 16174.5958836689. The cubic root of 261617552 is about 639.5712884074.

The spelling of 261617552 in words is "two hundred sixty-one million, six hundred seventeen thousand, five hundred fifty-two".