261051761705 has 16 divisors (see below), whose sum is σ = 358026614400. Its totient is φ = 179000537472.

The previous prime is 261051761693. The next prime is 261051761713. The reversal of 261051761705 is 507167150162.

It is a cyclic number.

It is not a de Polignac number, because 261051761705 - 2⁴ = 261051761689 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 997622 + ... + 1231808.

It is an arithmetic number, because the mean of its divisors is an integer number (22376663400).

Almost surely, 2^261051761705 is an apocalyptic number.

It is an amenable number.

261051761705 is a deficient number, since it is larger than the sum of its proper divisors (96974852695).

261051761705 is a wasteful number, since it uses less digits than its factorization.

261051761705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266048.

The product of its (nonzero) digits is 88200, while the sum is 41.

The spelling of 261051761705 in words is "two hundred sixty-one billion, fifty-one million, seven hundred sixty-one thousand, seven hundred five".