561653523 has 12 divisors (see below), whose sum is σ = 822704688. Its totient is φ = 369161520.

The previous prime is 561653507. The next prime is 561653551. The reversal of 561653523 is 325356165.

561653523 is a `hidden beast` number, since 5 + 616 + 5 + 35 + 2 + 3 = 666.

It is not a de Polignac number, because 561653523 - 2⁴ = 561653507 is a prime.

It is not an unprimeable number, because it can be changed into a prime (561653503) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 438840 + ... + 440117.

It is an arithmetic number, because the mean of its divisors is an integer number (68558724).

Almost surely, 2^561653523 is an apocalyptic number.

561653523 is a deficient number, since it is larger than the sum of its proper divisors (261051165).

561653523 is a wasteful number, since it uses less digits than its factorization.

561653523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 879034 (or 879031 counting only the distinct ones).

The product of its digits is 81000, while the sum is 36.

The square root of 561653523 is about 23699.2304305435. The cubic root of 561653523 is about 825.0675294585.

The spelling of 561653523 in words is "five hundred sixty-one million, six hundred fifty-three thousand, five hundred twenty-three".