261550602 has 24 divisors (see below), whose sum is σ = 568749636. Its totient is φ = 86867136.

The previous prime is 261550589. The next prime is 261550613. The reversal of 261550602 is 206055162.

261550602 is a `hidden beast` number, since 2 + 6 + 1 + 5 + 50 + 602 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 251571321 + 9979281 = 15861^2 + 3159^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21243 + ... + 31214.

Almost surely, 2^261550602 is an apocalyptic number.

261550602 is an abundant number, since it is smaller than the sum of its proper divisors (307199034).

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

261550602 is a wasteful number, since it uses less digits than its factorization.

261550602 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52742 (or 52739 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 261550602 is about 16172.5261477606. The cubic root of 261550602 is about 639.5167266364.

The spelling of 261550602 in words is "two hundred sixty-one million, five hundred fifty thousand, six hundred two".