120665563 has 4 divisors (see below), whose sum is σ = 120994720. Its totient is φ = 120336408.

The previous prime is 120665557. The next prime is 120665579. The reversal of 120665563 is 365566021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 365566021 = 227 ⋅1610423.

It is a cyclic number.

It is not a de Polignac number, because 120665563 - 2²⁵ = 87111131 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (120665533) 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, 164028 + ... + 164761.

It is an arithmetic number, because the mean of its divisors is an integer number (30248680).

Almost surely, 2^120665563 is an apocalyptic number.

120665563 is a deficient number, since it is larger than the sum of its proper divisors (329157).

120665563 is an equidigital number, since it uses as much as digits as its factorization.

120665563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329156.

The product of its (nonzero) digits is 32400, while the sum is 34.

The square root of 120665563 is about 10984.7877994980. The cubic root of 120665563 is about 494.1526338602.

The spelling of 120665563 in words is "one hundred twenty million, six hundred sixty-five thousand, five hundred sixty-three".