263934609409 has 2 divisors, whose sum is σ = 263934609410. Its totient is φ = 263934609408.

The previous prime is 263934609361. The next prime is 263934609431. The reversal of 263934609409 is 904906439362.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 221184911809 + 42749697600 = 470303^2 + 206760^2 .

It is a cyclic number.

It is not a de Polignac number, because 263934609409 - 2¹⁵ = 263934576641 is a prime.

It is a super-2 number, since 2×263934609409² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 263934609409.

It is not a weakly prime, because it can be changed into another prime (263934619409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131967304704 + 131967304705.

It is an arithmetic number, because the mean of its divisors is an integer number (131967304705).

Almost surely, 2^263934609409 is an apocalyptic number.

It is an amenable number.

263934609409 is a deficient number, since it is larger than the sum of its proper divisors (1).

263934609409 is an equidigital number, since it uses as much as digits as its factorization.

263934609409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7558272, while the sum is 55.

The spelling of 263934609409 in words is "two hundred sixty-three billion, nine hundred thirty-four million, six hundred nine thousand, four hundred nine".