261704656079 has 16 divisors (see below), whose sum is σ = 263689292160. Its totient is φ = 259729209600.

The previous prime is 261704656067. The next prime is 261704656091. The reversal of 261704656079 is 970656407162.

It is an interprime number because it is at equal distance from previous prime (261704656067) and next prime (261704656091).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261704656079 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261704656079.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261704656019) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 111031769 + ... + 111034125.

It is an arithmetic number, because the mean of its divisors is an integer number (16480580760).

Almost surely, 2^261704656079 is an apocalyptic number.

261704656079 is a deficient number, since it is larger than the sum of its proper divisors (1984636081).

261704656079 is a wasteful number, since it uses less digits than its factorization.

261704656079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3970.

The product of its (nonzero) digits is 3810240, while the sum is 53.

The spelling of 261704656079 in words is "two hundred sixty-one billion, seven hundred four million, six hundred fifty-six thousand, seventy-nine".