261421722350479 has 2 divisors, whose sum is σ = 261421722350480. Its totient is φ = 261421722350478.

The previous prime is 261421722350461. The next prime is 261421722350491. The reversal of 261421722350479 is 974053227124162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261421722350479 - 2³⁹ = 260871966536591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261421722350419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130710861175239 + 130710861175240.

It is an arithmetic number, because the mean of its divisors is an integer number (130710861175240).

Almost surely, 2^{261421722350479} is an apocalyptic number.

261421722350479 is a deficient number, since it is larger than the sum of its proper divisors (1).

261421722350479 is an equidigital number, since it uses as much as digits as its factorization.

261421722350479 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10160640, while the sum is 55.

The spelling of 261421722350479 in words is "two hundred sixty-one trillion, four hundred twenty-one billion, seven hundred twenty-two million, three hundred fifty thousand, four hundred seventy-nine".