261763389374159 has 2 divisors, whose sum is σ = 261763389374160. Its totient is φ = 261763389374158.

The previous prime is 261763389374041. The next prime is 261763389374171. The reversal of 261763389374159 is 951473983367162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261763389374159 - 2²⁸ = 261763120938703 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261763389373159) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130881694687079 + 130881694687080.

It is an arithmetic number, because the mean of its divisors is an integer number (130881694687080).

Almost surely, 2^{261763389374159} is an apocalyptic number.

261763389374159 is a deficient number, since it is larger than the sum of its proper divisors (1).

261763389374159 is an equidigital number, since it uses as much as digits as its factorization.

261763389374159 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1234517760, while the sum is 74.

The spelling of 261763389374159 in words is "two hundred sixty-one trillion, seven hundred sixty-three billion, three hundred eighty-nine million, three hundred seventy-four thousand, one hundred fifty-nine".