642538813622 has 8 divisors (see below), whose sum is σ = 964242179472. Its totient is φ = 321124753800.

The previous prime is 642538813591. The next prime is 642538813667. The reversal of 642538813622 is 226318835246.

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

It is a super-2 number, since 2×642538813622² (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 (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72320954 + ... + 72329837.

It is an arithmetic number, because the mean of its divisors is an integer number (120530272434).

Almost surely, 2^642538813622 is an apocalyptic number.

642538813622 is a deficient number, since it is larger than the sum of its proper divisors (321703365850).

642538813622 is a wasteful number, since it uses less digits than its factorization.

642538813622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144653014.

The product of its digits is 3317760, while the sum is 50.

The spelling of 642538813622 in words is "six hundred forty-two billion, five hundred thirty-eight million, eight hundred thirteen thousand, six hundred twenty-two".