771419658649 has 2 divisors, whose sum is σ = 771419658650. Its totient is φ = 771419658648.

The previous prime is 771419658587. The next prime is 771419658661. The reversal of 771419658649 is 946856914177.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 706684016025 + 64735642624 = 840645^2 + 254432^2 .

It is a cyclic number.

It is not a de Polignac number, because 771419658649 - 2³³ = 762829724057 is a prime.

It is not a weakly prime, because it can be changed into another prime (771419658349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 385709829324 + 385709829325.

It is an arithmetic number, because the mean of its divisors is an integer number (385709829325).

Almost surely, 2^771419658649 is an apocalyptic number.

It is an amenable number.

771419658649 is a deficient number, since it is larger than the sum of its proper divisors (1).

771419658649 is an equidigital number, since it uses as much as digits as its factorization.

771419658649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 91445760, while the sum is 67.

The spelling of 771419658649 in words is "seven hundred seventy-one billion, four hundred nineteen million, six hundred fifty-eight thousand, six hundred forty-nine".