261304415951 has 2 divisors, whose sum is σ = 261304415952. Its totient is φ = 261304415950.

The previous prime is 261304415923. The next prime is 261304416047. The reversal of 261304415951 is 159514403162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261304415951 - 2¹⁰ = 261304414927 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 261304415899 and 261304415908.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261304415651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130652207975 + 130652207976.

It is an arithmetic number, because the mean of its divisors is an integer number (130652207976).

Almost surely, 2^261304415951 is an apocalyptic number.

261304415951 is a deficient number, since it is larger than the sum of its proper divisors (1).

261304415951 is an equidigital number, since it uses as much as digits as its factorization.

261304415951 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 129600, while the sum is 41.

The spelling of 261304415951 in words is "two hundred sixty-one billion, three hundred four million, four hundred fifteen thousand, nine hundred fifty-one".