6601561772 has 48 divisors (see below), whose sum is σ = 12520448640. Its totient is φ = 3027593472.

The previous prime is 6601561763. The next prime is 6601561789. The reversal of 6601561772 is 2771651066.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9181229 + ... + 9181947.

It is an arithmetic number, because the mean of its divisors is an integer number (260842680).

Almost surely, 2^6601561772 is an apocalyptic number.

It is an amenable number.

6601561772 is a deficient number, since it is larger than the sum of its proper divisors (5918886868).

6601561772 is a wasteful number, since it uses less digits than its factorization.

6601561772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1610 (or 1608 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 41.

The square root of 6601561772 is about 81249.9955199999. The cubic root of 6601561772 is about 1875.9254000974.

The spelling of 6601561772 in words is "six billion, six hundred one million, five hundred sixty-one thousand, seven hundred seventy-two".