261533456351656 has 32 divisors (see below), whose sum is σ = 503966848905000. Its totient is φ = 127147043782656.

The previous prime is 261533456351543. The next prime is 261533456351681. The reversal of 261533456351656 is 656153654335162.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 258096755852100 + 3436700499556 = 16065390^2 + 1853834^2 .

It is a junction number, because it is equal to n+sod(n) for n = 261533456351594 and 261533456351603.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 296254681 + ... + 297136168.

Almost surely, 2^{261533456351656} is an apocalyptic number.

It is an amenable number.

261533456351656 is a deficient number, since it is larger than the sum of its proper divisors (242433392553344).

261533456351656 is a wasteful number, since it uses less digits than its factorization.

261533456351656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 593392381 (or 593392377 counting only the distinct ones).

The product of its digits is 174960000, while the sum is 61.

The spelling of 261533456351656 in words is "two hundred sixty-one trillion, five hundred thirty-three billion, four hundred fifty-six million, three hundred fifty-one thousand, six hundred fifty-six".