775942691441 has 4 divisors (see below), whose sum is σ = 796914115572. Its totient is φ = 754971267312.

The previous prime is 775942691417. The next prime is 775942691479. The reversal of 775942691441 is 144196249577.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 144196249577 = 41 ⋅3516981697.

It can be written as a sum of positive squares in 2 ways, for example, as 665196835216 + 110745856225 = 815596^2 + 332785^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-775942691441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (775942691941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10485712010 + ... + 10485712083.

It is an arithmetic number, because the mean of its divisors is an integer number (199228528893).

Almost surely, 2^775942691441 is an apocalyptic number.

It is an amenable number.

775942691441 is a deficient number, since it is larger than the sum of its proper divisors (20971424131).

775942691441 is a wasteful number, since it uses less digits than its factorization.

775942691441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20971424130.

The product of its digits is 15240960, while the sum is 59.

The spelling of 775942691441 in words is "seven hundred seventy-five billion, nine hundred forty-two million, six hundred ninety-one thousand, four hundred forty-one".