268521599477 has 2 divisors, whose sum is σ = 268521599478. Its totient is φ = 268521599476.

The previous prime is 268521599461. The next prime is 268521599551. The reversal of 268521599477 is 774995125862.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 136579028356 + 131942571121 = 369566^2 + 363239^2 .

It is a cyclic number.

It is not a de Polignac number, because 268521599477 - 2⁴ = 268521599461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (268521599377) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134260799738 + 134260799739.

It is an arithmetic number, because the mean of its divisors is an integer number (134260799739).

Almost surely, 2^268521599477 is an apocalyptic number.

It is an amenable number.

268521599477 is a deficient number, since it is larger than the sum of its proper divisors (1).

268521599477 is an equidigital number, since it uses as much as digits as its factorization.

268521599477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 76204800, while the sum is 65.

The spelling of 268521599477 in words is "two hundred sixty-eight billion, five hundred twenty-one million, five hundred ninety-nine thousand, four hundred seventy-seven".