775072561 has 4 divisors (see below), whose sum is σ = 808771392. Its totient is φ = 741373732.

The previous prime is 775072553. The next prime is 775072601. The reversal of 775072561 is 165270577.

775072561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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: 165270577 = 5507 ⋅30011.

It is a cyclic number.

It is not a de Polignac number, because 775072561 - 2³ = 775072553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (775072511) 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, 16849381 + ... + 16849426.

It is an arithmetic number, because the mean of its divisors is an integer number (202192848).

Almost surely, 2^775072561 is an apocalyptic number.

It is an amenable number.

775072561 is a deficient number, since it is larger than the sum of its proper divisors (33698831).

775072561 is a wasteful number, since it uses less digits than its factorization.

775072561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33698830.

The product of its (nonzero) digits is 102900, while the sum is 40.

The square root of 775072561 is about 27840.1250176791. The cubic root of 775072561 is about 918.5739410216.

The spelling of 775072561 in words is "seven hundred seventy-five million, seventy-two thousand, five hundred sixty-one".