620641639449 has 32 divisors (see below), whose sum is σ = 1000405763840. Its totient is φ = 377995838976.

The previous prime is 620641639441. The next prime is 620641639459. The reversal of 620641639449 is 944936146026.

620641639449 is a `hidden beast` number, since 6 + 206 + 4 + 1 + 6 + 394 + 49 = 666.

It is not a de Polignac number, because 620641639449 - 2³ = 620641639441 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 620641639395 and 620641639404.

It is not an unprimeable number, because it can be changed into a prime (620641639441) 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 31 ways as a sum of consecutive naturals, for example, 9080437 + ... + 9148530.

It is an arithmetic number, because the mean of its divisors is an integer number (31262680120).

Almost surely, 2^620641639449 is an apocalyptic number.

It is an amenable number.

620641639449 is a deficient number, since it is larger than the sum of its proper divisors (379764124391).

620641639449 is a wasteful number, since it uses less digits than its factorization.

620641639449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18229086 (or 18229080 counting only the distinct ones).

The product of its (nonzero) digits is 6718464, while the sum is 54.

The spelling of 620641639449 in words is "six hundred twenty billion, six hundred forty-one million, six hundred thirty-nine thousand, four hundred forty-nine".