261055967650 has 12 divisors (see below), whose sum is σ = 485564099922. Its totient is φ = 104422387040.

The previous prime is 261055967639. The next prime is 261055967671. The reversal of 261055967650 is 56769550162.

It can be written as a sum of positive squares in 3 ways, for example, as 224239184521 + 36816783129 = 473539^2 + 191877^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2610559627 + ... + 2610559726.

Almost surely, 2^261055967650 is an apocalyptic number.

261055967650 is a deficient number, since it is larger than the sum of its proper divisors (224508132272).

261055967650 is a wasteful number, since it uses less digits than its factorization.

261055967650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5221119365 (or 5221119360 counting only the distinct ones).

The product of its (nonzero) digits is 3402000, while the sum is 52.

The spelling of 261055967650 in words is "two hundred sixty-one billion, fifty-five million, nine hundred sixty-seven thousand, six hundred fifty".