755257561 has 4 divisors (see below), whose sum is σ = 755315712. Its totient is φ = 755199412.

The previous prime is 755257553. The next prime is 755257627. The reversal of 755257561 is 165752557.

It is a happy number.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 165752557 = 733 ⋅226129.

It is a cyclic number.

It is not a de Polignac number, because 755257561 - 2³ = 755257553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (755257541) 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, 300 + ... + 38866.

It is an arithmetic number, because the mean of its divisors is an integer number (188828928).

Almost surely, 2^755257561 is an apocalyptic number.

It is an amenable number.

755257561 is a deficient number, since it is larger than the sum of its proper divisors (58151).

755257561 is a wasteful number, since it uses less digits than its factorization.

755257561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58150.

The product of its digits is 367500, while the sum is 43.

The square root of 755257561 is about 27481.9497306869. The cubic root of 755257561 is about 910.6783819732.

The spelling of 755257561 in words is "seven hundred fifty-five million, two hundred fifty-seven thousand, five hundred sixty-one".