261161263123 has 2 divisors, whose sum is σ = 261161263124. Its totient is φ = 261161263122.

The previous prime is 261161263109. The next prime is 261161263151. The reversal of 261161263123 is 321362161162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261161263123 - 2⁵ = 261161263091 is a prime.

It is not a weakly prime, because it can be changed into another prime (261161263523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130580631561 + 130580631562.

It is an arithmetic number, because the mean of its divisors is an integer number (130580631562).

Almost surely, 2^261161263123 is an apocalyptic number.

261161263123 is a deficient number, since it is larger than the sum of its proper divisors (1).

261161263123 is an equidigital number, since it uses as much as digits as its factorization.

261161263123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 15552, while the sum is 34.

The spelling of 261161263123 in words is "two hundred sixty-one billion, one hundred sixty-one million, two hundred sixty-three thousand, one hundred twenty-three".