261647577350226 has 24 divisors (see below), whose sum is σ = 600250324510044. Its totient is φ = 82085514462720.

The previous prime is 261647577350197. The next prime is 261647577350233. The reversal of 261647577350226 is 622053775746162.

261647577350226 is a `hidden beast` number, since 2 + 6 + 1 + 6 + 4 + 7 + 57 + 7 + 350 + 226 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 261625804872201 + 21772478025 = 16174851^2 + 147555^2 .

It is a Curzon number.

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, 427528720855 + ... + 427528721466.

Almost surely, 2^{261647577350226} is an apocalyptic number.

261647577350226 is an abundant number, since it is smaller than the sum of its proper divisors (338602747159818).

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

261647577350226 is a wasteful number, since it uses less digits than its factorization.

261647577350226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 855057442346 (or 855057442343 counting only the distinct ones).

The product of its (nonzero) digits is 177811200, while the sum is 63.

The spelling of 261647577350226 in words is "two hundred sixty-one trillion, six hundred forty-seven billion, five hundred seventy-seven million, three hundred fifty thousand, two hundred twenty-six".