642257222177642 has 8 divisors (see below), whose sum is σ = 963439179897600. Its totient is φ = 321110828878444.

The previous prime is 642257222177429. The next prime is 642257222177647. The reversal of 642257222177642 is 246771222752246.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (642257222177647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8891060042 + ... + 8891132277.

It is an arithmetic number, because the mean of its divisors is an integer number (120429897487200).

Almost surely, 2^{642257222177642} is an apocalyptic number.

642257222177642 is a deficient number, since it is larger than the sum of its proper divisors (321181957719958).

642257222177642 is a wasteful number, since it uses less digits than its factorization.

642257222177642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17782210380.

The product of its digits is 63221760, while the sum is 59.

The spelling of 642257222177642 in words is "six hundred forty-two trillion, two hundred fifty-seven billion, two hundred twenty-two million, one hundred seventy-seven thousand, six hundred forty-two".