771132638849 has 2 divisors, whose sum is σ = 771132638850. Its totient is φ = 771132638848.

The previous prime is 771132638831. The next prime is 771132638891. The reversal of 771132638849 is 948836231177.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 391165186624 + 379967452225 = 625432^2 + 616415^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-771132638849 is a prime.

It is not a weakly prime, because it can be changed into another prime (771132638149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 385566319424 + 385566319425.

It is an arithmetic number, because the mean of its divisors is an integer number (385566319425).

Almost surely, 2^771132638849 is an apocalyptic number.

It is an amenable number.

771132638849 is a deficient number, since it is larger than the sum of its proper divisors (1).

771132638849 is an equidigital number, since it uses as much as digits as its factorization.

771132638849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12192768, while the sum is 59.

The spelling of 771132638849 in words is "seven hundred seventy-one billion, one hundred thirty-two million, six hundred thirty-eight thousand, eight hundred forty-nine".