261552606 has 16 divisors (see below), whose sum is σ = 597834624. Its totient is φ = 74729304.

The previous prime is 261552601. The next prime is 261552631. The reversal of 261552606 is 606255162.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261552601) 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, 3113680 + ... + 3113763.

It is an arithmetic number, because the mean of its divisors is an integer number (37364664).

Almost surely, 2^261552606 is an apocalyptic number.

261552606 is an abundant number, since it is smaller than the sum of its proper divisors (336282018).

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

261552606 is a wasteful number, since it uses less digits than its factorization.

261552606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6227455.

The product of its (nonzero) digits is 21600, while the sum is 33.

The square root of 261552606 is about 16172.5881045676. The cubic root of 261552606 is about 639.5183599574.

The spelling of 261552606 in words is "two hundred sixty-one million, five hundred fifty-two thousand, six hundred six".