642266620220 has 12 divisors (see below), whose sum is σ = 1348759902504. Its totient is φ = 256906648080.

The previous prime is 642266620189. The next prime is 642266620267. The reversal of 642266620220 is 22026662246.

It is a super-2 number, since 2×642266620220² (a number of 24 digits) contains 22 as substring.

It is a congruent 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 3 ways as a sum of consecutive naturals, for example, 16056665486 + ... + 16056665525.

It is an arithmetic number, because the mean of its divisors is an integer number (112396658542).

Almost surely, 2^642266620220 is an apocalyptic number.

It is an amenable number.

642266620220 is an abundant number, since it is smaller than the sum of its proper divisors (706493282284).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

642266620220 is a wasteful number, since it uses less digits than its factorization.

642266620220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32113331020 (or 32113331018 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 38.

The spelling of 642266620220 in words is "six hundred forty-two billion, two hundred sixty-six million, six hundred twenty thousand, two hundred twenty".