6601566231 has 32 divisors (see below), whose sum is σ = 10576251840. Its totient is φ = 4045593600.

The previous prime is 6601566221. The next prime is 6601566239. The reversal of 6601566231 is 1326651066.

6601566231 is a `hidden beast` number, since 6 + 60 + 1 + 566 + 2 + 31 = 666.

It is not a de Polignac number, because 6601566231 - 2¹⁰ = 6601565207 is a prime.

It is a super-4 number, since 4×6601566231⁴ (a number of 40 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6601566239) 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, 45571 + ... + 123611.

It is an arithmetic number, because the mean of its divisors is an integer number (330507870).

Almost surely, 2^6601566231 is an apocalyptic number.

6601566231 is a deficient number, since it is larger than the sum of its proper divisors (3974685609).

6601566231 is a wasteful number, since it uses less digits than its factorization.

6601566231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78304 (or 78298 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 6601566231 is about 81250.0229599968. The cubic root of 6601566231 is about 1875.9258224596.

The spelling of 6601566231 in words is "six billion, six hundred one million, five hundred sixty-six thousand, two hundred thirty-one".