6601772820 has 24 divisors (see below), whose sum is σ = 18484964064. Its totient is φ = 1760472736.

The previous prime is 6601772791. The next prime is 6601772833. The reversal of 6601772820 is 282771066.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55014714 + ... + 55014833.

It is an arithmetic number, because the mean of its divisors is an integer number (770206836).

Almost surely, 2^6601772820 is an apocalyptic number.

6601772820 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

6601772820 is an abundant number, since it is smaller than the sum of its proper divisors (11883191244).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6601772820 is a wasteful number, since it uses less digits than its factorization.

6601772820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110029559 (or 110029557 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 39.

The square root of 6601772820 is about 81251.2942666146. The cubic root of 6601772820 is about 1875.9453906238.

The spelling of 6601772820 in words is "six billion, six hundred one million, seven hundred seventy-two thousand, eight hundred twenty".