775057561 has 4 divisors (see below), whose sum is σ = 777917824. Its totient is φ = 772197300.

The previous prime is 775057553. The next prime is 775057579. The reversal of 775057561 is 165750577.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 165750577 = 41 ⋅4042697.

It is a cyclic number.

It is not a de Polignac number, because 775057561 - 2³ = 775057553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (775057511) 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, 1429725 + ... + 1430266.

It is an arithmetic number, because the mean of its divisors is an integer number (194479456).

Almost surely, 2^775057561 is an apocalyptic number.

It is an amenable number.

775057561 is a deficient number, since it is larger than the sum of its proper divisors (2860263).

775057561 is a wasteful number, since it uses less digits than its factorization.

775057561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2860262.

The product of its (nonzero) digits is 257250, while the sum is 43.

The square root of 775057561 is about 27839.8556210337. The cubic root of 775057561 is about 918.5680152547.

The spelling of 775057561 in words is "seven hundred seventy-five million, fifty-seven thousand, five hundred sixty-one".