6620251329 has 6 divisors (see below), whose sum is σ = 9562585266. Its totient is φ = 4413500880.

The previous prime is 6620251327. The next prime is 6620251361. The reversal of 6620251329 is 9231520266.

6620251329 is a `hidden beast` number, since 6 + 620 + 2 + 5 + 1 + 3 + 29 = 666.

It can be written as a sum of positive squares in only one way, i.e., 6196838400 + 423412929 = 78720^2 + 20577^2 .

It is not a de Polignac number, because 6620251329 - 2¹ = 6620251327 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6620251293 and 6620251302.

It is not an unprimeable number, because it can be changed into a prime (6620251321) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 367791732 + ... + 367791749.

It is an arithmetic number, because the mean of its divisors is an integer number (1593764211).

Almost surely, 2^6620251329 is an apocalyptic number.

It is an amenable number.

6620251329 is a deficient number, since it is larger than the sum of its proper divisors (2942333937).

6620251329 is a wasteful number, since it uses less digits than its factorization.

6620251329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 735583487 (or 735583484 counting only the distinct ones).

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

The square root of 6620251329 is about 81364.9268972817. The cubic root of 6620251329 is about 1877.6940311042.

The spelling of 6620251329 in words is "six billion, six hundred twenty million, two hundred fifty-one thousand, three hundred twenty-nine".