263404391647 has 2 divisors, whose sum is σ = 263404391648. Its totient is φ = 263404391646.

The previous prime is 263404391617. The next prime is 263404391671. The reversal of 263404391647 is 746193404362.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 263404391647 - 2¹⁵ = 263404358879 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 263404391647.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (263404391617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131702195823 + 131702195824.

It is an arithmetic number, because the mean of its divisors is an integer number (131702195824).

Almost surely, 2^263404391647 is an apocalyptic number.

263404391647 is a deficient number, since it is larger than the sum of its proper divisors (1).

263404391647 is an equidigital number, since it uses as much as digits as its factorization.

263404391647 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2612736, while the sum is 49.

The spelling of 263404391647 in words is "two hundred sixty-three billion, four hundred four million, three hundred ninety-one thousand, six hundred forty-seven".