263994887977 has 2 divisors, whose sum is σ = 263994887978. Its totient is φ = 263994887976.

The previous prime is 263994887963. The next prime is 263994888023. The reversal of 263994887977 is 779788499362.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 263994550416 + 337561 = 513804^2 + 581^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-263994887977 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 263994887897 and 263994887906.

It is not a weakly prime, because it can be changed into another prime (263994387977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131997443988 + 131997443989.

It is an arithmetic number, because the mean of its divisors is an integer number (131997443989).

Almost surely, 2^263994887977 is an apocalyptic number.

It is an amenable number.

263994887977 is a deficient number, since it is larger than the sum of its proper divisors (1).

263994887977 is an equidigital number, since it uses as much as digits as its factorization.

263994887977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2304433152, while the sum is 79.

The spelling of 263994887977 in words is "two hundred sixty-three billion, nine hundred ninety-four million, eight hundred eighty-seven thousand, nine hundred seventy-seven".