263548210649 has 2 divisors, whose sum is σ = 263548210650. Its totient is φ = 263548210648.

The previous prime is 263548210603. The next prime is 263548210669. The reversal of 263548210649 is 946012845362.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 239274570649 + 24273640000 = 489157^2 + 155800^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-263548210649 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 263548210597 and 263548210606.

It is not a weakly prime, because it can be changed into another prime (263548210669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131774105324 + 131774105325.

It is an arithmetic number, because the mean of its divisors is an integer number (131774105325).

Almost surely, 2^263548210649 is an apocalyptic number.

It is an amenable number.

263548210649 is a deficient number, since it is larger than the sum of its proper divisors (1).

263548210649 is an equidigital number, since it uses as much as digits as its factorization.

263548210649 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2488320, while the sum is 50.

The spelling of 263548210649 in words is "two hundred sixty-three billion, five hundred forty-eight million, two hundred ten thousand, six hundred forty-nine".