6630853781 has 8 divisors (see below), whose sum is σ = 6903938328. Its totient is φ = 6363072000.

The previous prime is 6630853771. The next prime is 6630853787. The reversal of 6630853781 is 1873580366.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1678213156 + 4952640625 = 40966^2 + 70375^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6630853781 - 2¹⁸ = 6630591637 is a prime.

It is a super-2 number, since 2×6630853781² = 87936443730003991922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6630853787) by changing a digit.

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, 1323140 + ... + 1328141.

It is an arithmetic number, because the mean of its divisors is an integer number (862992291).

Almost surely, 2^6630853781 is an apocalyptic number.

6630853781 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

6630853781 is a deficient number, since it is larger than the sum of its proper divisors (273084547).

6630853781 is a wasteful number, since it uses less digits than its factorization.

6630853781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2651383.

The product of its (nonzero) digits is 725760, while the sum is 47.

The square root of 6630853781 is about 81430.0545314812. The cubic root of 6630853781 is about 1878.6958834274.

The spelling of 6630853781 in words is "six billion, six hundred thirty million, eight hundred fifty-three thousand, seven hundred eighty-one".