771440938943 has 2 divisors, whose sum is σ = 771440938944. Its totient is φ = 771440938942.

The previous prime is 771440938847. The next prime is 771440938951. The reversal of 771440938943 is 349839044177.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-771440938943 is a prime.

It is a super-2 number, since 2×771440938943² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (771440938843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 385720469471 + 385720469472.

It is an arithmetic number, because the mean of its divisors is an integer number (385720469472).

Almost surely, 2^771440938943 is an apocalyptic number.

771440938943 is a deficient number, since it is larger than the sum of its proper divisors (1).

771440938943 is an equidigital number, since it uses as much as digits as its factorization.

771440938943 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18289152, while the sum is 59.

The spelling of 771440938943 in words is "seven hundred seventy-one billion, four hundred forty million, nine hundred thirty-eight thousand, nine hundred forty-three".