642026105876 has 6 divisors (see below), whose sum is σ = 1123545685290. Its totient is φ = 321013052936.

The previous prime is 642026105843. The next prime is 642026105881. The reversal of 642026105876 is 678501620246.

It can be written as a sum of positive squares in only one way, i.e., 638416980100 + 3609125776 = 799010^2 + 60076^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 642026105876.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80253263231 + ... + 80253263238.

It is an arithmetic number, because the mean of its divisors is an integer number (187257614215).

Almost surely, 2^642026105876 is an apocalyptic number.

It is an amenable number.

642026105876 is a deficient number, since it is larger than the sum of its proper divisors (481519579414).

642026105876 is a wasteful number, since it uses less digits than its factorization.

642026105876 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160506526473 (or 160506526471 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 47.

The spelling of 642026105876 in words is "six hundred forty-two billion, twenty-six million, one hundred five thousand, eight hundred seventy-six".