523403661 has 32 divisors (see below), whose sum is σ = 772996608. Its totient is φ = 312386240.

The previous prime is 523403651. The next prime is 523403707. The reversal of 523403661 is 166304325.

It is a cyclic number.

It is not a de Polignac number, because 523403661 - 2⁹ = 523403149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (523403651) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 801211 + ... + 801863.

It is an arithmetic number, because the mean of its divisors is an integer number (24156144).

Almost surely, 2^523403661 is an apocalyptic number.

It is an amenable number.

523403661 is a deficient number, since it is larger than the sum of its proper divisors (249592947).

523403661 is a wasteful number, since it uses less digits than its factorization.

523403661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1001.

The product of its (nonzero) digits is 12960, while the sum is 30.

The square root of 523403661 is about 22878.0169813732. The cubic root of 523403661 is about 805.8958487378.

Adding to 523403661 its reverse (166304325), we get a palindrome (689707986).

The spelling of 523403661 in words is "five hundred twenty-three million, four hundred three thousand, six hundred sixty-one".