660561122523 has 16 divisors (see below), whose sum is σ = 932575333536. Its totient is φ = 414461521920.

The previous prime is 660561122509. The next prime is 660561122569. The reversal of 660561122523 is 325221165066.

660561122523 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 660561122523 - 2³² = 656266155227 is a prime.

It is not an unprimeable number, because it can be changed into a prime (660561122323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3437343 + ... + 3624423.

It is an arithmetic number, because the mean of its divisors is an integer number (58285958346).

Almost surely, 2^660561122523 is an apocalyptic number.

660561122523 is a deficient number, since it is larger than the sum of its proper divisors (272014211013).

660561122523 is a wasteful number, since it uses less digits than its factorization.

660561122523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256334.

The product of its (nonzero) digits is 129600, while the sum is 39.

Adding to 660561122523 its reverse (325221165066), we get a palindrome (985782287589).

The spelling of 660561122523 in words is "six hundred sixty billion, five hundred sixty-one million, one hundred twenty-two thousand, five hundred twenty-three".