261658606 has 32 divisors (see below), whose sum is σ = 434004480. Its totient is φ = 117328800.

The previous prime is 261658591. The next prime is 261658609. The reversal of 261658606 is 606856162.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261658609) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 841191 + ... + 841501.

It is an arithmetic number, because the mean of its divisors is an integer number (13562640).

Almost surely, 2^261658606 is an apocalyptic number.

261658606 is a deficient number, since it is larger than the sum of its proper divisors (172345874).

261658606 is a wasteful number, since it uses less digits than its factorization.

261658606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 720.

The product of its (nonzero) digits is 103680, while the sum is 40.

The square root of 261658606 is about 16175.8649227792. The cubic root of 261658606 is about 639.6047412933.

The spelling of 261658606 in words is "two hundred sixty-one million, six hundred fifty-eight thousand, six hundred six".