642221163788 has 12 divisors (see below), whose sum is σ = 1162641762240. Its totient is φ = 310037803152.

The previous prime is 642221163781. The next prime is 642221163791. The reversal of 642221163788 is 887361122246.

It is not an unprimeable number, because it can be changed into a prime (642221163781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2768194556 + ... + 2768194787.

It is an arithmetic number, because the mean of its divisors is an integer number (96886813520).

Almost surely, 2^642221163788 is an apocalyptic number.

It is an amenable number.

642221163788 is a deficient number, since it is larger than the sum of its proper divisors (520420598452).

642221163788 is a wasteful number, since it uses less digits than its factorization.

642221163788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5536389376 (or 5536389374 counting only the distinct ones).

The product of its digits is 1548288, while the sum is 50.

The spelling of 642221163788 in words is "six hundred forty-two billion, two hundred twenty-one million, one hundred sixty-three thousand, seven hundred eighty-eight".