642226969944 has 120 divisors (see below), whose sum is σ = 2092516832340. Its totient is φ = 183493410912.

The previous prime is 642226969939. The next prime is 642226969973. The reversal of 642226969944 is 449969622246.

642226969944 is a `hidden beast` number, since 6 + 422 + 2 + 69 + 69 + 94 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 10081422 + ... + 10144925.

Almost surely, 2^642226969944 is an apocalyptic number.

It is an amenable number.

642226969944 is an abundant number, since it is smaller than the sum of its proper divisors (1450289862396).

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

642226969944 is a wasteful number, since it uses less digits than its factorization.

642226969944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20226379 (or 20226359 counting only the distinct ones).

The product of its digits is 80621568, while the sum is 63.

The spelling of 642226969944 in words is "six hundred forty-two billion, two hundred twenty-six million, nine hundred sixty-nine thousand, nine hundred forty-four".