775125521591 has 2 divisors, whose sum is σ = 775125521592. Its totient is φ = 775125521590.

The previous prime is 775125521549. The next prime is 775125521669. The reversal of 775125521591 is 195125521577.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-775125521591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (775125521791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 387562760795 + 387562760796.

It is an arithmetic number, because the mean of its divisors is an integer number (387562760796).

Almost surely, 2^775125521591 is an apocalyptic number.

775125521591 is a deficient number, since it is larger than the sum of its proper divisors (1).

775125521591 is an equidigital number, since it uses as much as digits as its factorization.

775125521591 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1102500, while the sum is 50.

The spelling of 775125521591 in words is "seven hundred seventy-five billion, one hundred twenty-five million, five hundred twenty-one thousand, five hundred ninety-one".