620106145921 has 16 divisors (see below), whose sum is σ = 684181682640. Its totient is φ = 559390935040.

The previous prime is 620106145913. The next prime is 620106145961. The reversal of 620106145921 is 129541601026.

It can be written as a sum of positive squares in 8 ways, for example, as 109544450625 + 510561695296 = 330975^2 + 714536^2 .

It is not a de Polignac number, because 620106145921 - 2³ = 620106145913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (620106145961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4523050 + ... + 4658131.

It is an arithmetic number, because the mean of its divisors is an integer number (42761355165).

Almost surely, 2^620106145921 is an apocalyptic number.

It is an amenable number.

620106145921 is a deficient number, since it is larger than the sum of its proper divisors (64075536719).

620106145921 is a wasteful number, since it uses less digits than its factorization.

620106145921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9181364.

The product of its (nonzero) digits is 25920, while the sum is 37.

Adding to 620106145921 its reverse (129541601026), we get a palindrome (749647746947).

The spelling of 620106145921 in words is "six hundred twenty billion, one hundred six million, one hundred forty-five thousand, nine hundred twenty-one".