620066521421 has 8 divisors (see below), whose sum is σ = 637290303480. Its totient is φ = 603307917504.

The previous prime is 620066521367. The next prime is 620066521427. The reversal of 620066521421 is 124125660026.

It can be written as a sum of positive squares in 4 ways, for example, as 374561136196 + 245505385225 = 612014^2 + 495485^2 .

It is not a de Polignac number, because 620066521421 - 2¹⁰ = 620066520397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620066521427) 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, 6070076 + ... + 6171381.

It is an arithmetic number, because the mean of its divisors is an integer number (79661287935).

Almost surely, 2^620066521421 is an apocalyptic number.

It is an amenable number.

620066521421 is a deficient number, since it is larger than the sum of its proper divisors (17223782059).

620066521421 is an frugal number, since it uses more digits than its factorization.

620066521421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12241568 (or 12241494 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 35.

The spelling of 620066521421 in words is "six hundred twenty billion, sixty-six million, five hundred twenty-one thousand, four hundred twenty-one".