642271673650 has 24 divisors (see below), whose sum is σ = 1222407301104. Its totient is φ = 250934048400.

The previous prime is 642271673627. The next prime is 642271673669. The reversal of 642271673650 is 56376172246.

It is a junction number, because it is equal to n+sod(n) for n = 642271673594 and 642271673603.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 149363356 + ... + 149367655.

It is an arithmetic number, because the mean of its divisors is an integer number (50933637546).

Almost surely, 2^642271673650 is an apocalyptic number.

642271673650 is a deficient number, since it is larger than the sum of its proper divisors (580135627454).

642271673650 is a wasteful number, since it uses less digits than its factorization.

642271673650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298731066 (or 298731061 counting only the distinct ones).

The product of its (nonzero) digits is 2540160, while the sum is 49.

The spelling of 642271673650 in words is "six hundred forty-two billion, two hundred seventy-one million, six hundred seventy-three thousand, six hundred fifty".