642660243622 has 16 divisors (see below), whose sum is σ = 982532996352. Its totient is φ = 315153616960.

The previous prime is 642660243619. The next prime is 642660243703. The reversal of 642660243622 is 226342066246.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 797254 + ... + 1385977.

It is an arithmetic number, because the mean of its divisors is an integer number (61408312272).

Almost surely, 2^642660243622 is an apocalyptic number.

642660243622 is a deficient number, since it is larger than the sum of its proper divisors (339872752730).

642660243622 is a wasteful number, since it uses less digits than its factorization.

642660243622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2186063.

The product of its (nonzero) digits is 995328, while the sum is 43.

The spelling of 642660243622 in words is "six hundred forty-two billion, six hundred sixty million, two hundred forty-three thousand, six hundred twenty-two".