263274304357781 has 2 divisors, whose sum is σ = 263274304357782. Its totient is φ = 263274304357780.

The previous prime is 263274304357657. The next prime is 263274304357793. The reversal of 263274304357781 is 187753403472362.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 205914751072900 + 57359553284881 = 14349730^2 + 7573609^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-263274304357781 is a prime.

It is a super-2 number, since 2×263274304357781² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (263274304350781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131637152178890 + 131637152178891.

It is an arithmetic number, because the mean of its divisors is an integer number (131637152178891).

Almost surely, 2^{263274304357781} is an apocalyptic number.

It is an amenable number.

263274304357781 is a deficient number, since it is larger than the sum of its proper divisors (1).

263274304357781 is an equidigital number, since it uses as much as digits as its factorization.

263274304357781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 142248960, while the sum is 62.

The spelling of 263274304357781 in words is "two hundred sixty-three trillion, two hundred seventy-four billion, three hundred four million, three hundred fifty-seven thousand, seven hundred eighty-one".