523355661 has 32 divisors (see below), whose sum is σ = 797984640. Its totient is φ = 343096560.

The previous prime is 523355641. The next prime is 523355683. The reversal of 523355661 is 166553325.

It is not a de Polignac number, because 523355661 - 2⁶ = 523355597 is a prime.

It is a super-2 number, since 2×523355661² = 547802295801493842, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (523355641) 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, 131446 + ... + 135368.

It is an arithmetic number, because the mean of its divisors is an integer number (24937020).

Almost surely, 2^523355661 is an apocalyptic number.

It is an amenable number.

523355661 is a deficient number, since it is larger than the sum of its proper divisors (274628979).

523355661 is an frugal number, since it uses more digits than its factorization.

523355661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4005 (or 3987 counting only the distinct ones).

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

The square root of 523355661 is about 22876.9679153510. The cubic root of 523355661 is about 805.8712124413.

The spelling of 523355661 in words is "five hundred twenty-three million, three hundred fifty-five thousand, six hundred sixty-one".