620506220665 has 8 divisors (see below), whose sum is σ = 762768622728. Its totient is φ = 484297537920.

The previous prime is 620506220639. The next prime is 620506220687. The reversal of 620506220665 is 566022605026.

It can be written as a sum of positive squares in 4 ways, for example, as 66071103849 + 554435116816 = 257043^2 + 744604^2 .

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

It is not a de Polignac number, because 620506220665 - 2²¹ = 620504123513 is a prime.

It is a Duffinian 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, 1513429602 + ... + 1513430011.

It is an arithmetic number, because the mean of its divisors is an integer number (95346077841).

Almost surely, 2^620506220665 is an apocalyptic number.

It is an amenable number.

620506220665 is a deficient number, since it is larger than the sum of its proper divisors (142262402063).

620506220665 is a wasteful number, since it uses less digits than its factorization.

620506220665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3026859659.

The product of its (nonzero) digits is 259200, while the sum is 40.

The spelling of 620506220665 in words is "six hundred twenty billion, five hundred six million, two hundred twenty thousand, six hundred sixty-five".