261760661646650 has 48 divisors (see below), whose sum is σ = 494859859665120. Its totient is φ = 102987078225600.

The previous prime is 261760661646643. The next prime is 261760661646683. The reversal of 261760661646650 is 56646166067162.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 704178137 + ... + 704549763.

It is an arithmetic number, because the mean of its divisors is an integer number (10309580409690).

Almost surely, 2^{261760661646650} is an apocalyptic number.

261760661646650 is a deficient number, since it is larger than the sum of its proper divisors (233099198018470).

261760661646650 is a wasteful number, since it uses less digits than its factorization.

261760661646650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 602639 (or 602634 counting only the distinct ones).

The product of its (nonzero) digits is 78382080, while the sum is 62.

The spelling of 261760661646650 in words is "two hundred sixty-one trillion, seven hundred sixty billion, six hundred sixty-one million, six hundred forty-six thousand, six hundred fifty".