642508052356 has 27 divisors (see below), whose sum is σ = 1129753311813. Its totient is φ = 319728646080.

The previous prime is 642508052323. The next prime is 642508052413. The reversal of 642508052356 is 653250805246.

The square root of 642508052356 is 801566.

It is a perfect power (a square), and thus also a powerful number.

642508052356 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 483211277956 + 159296774400 = 695134^2 + 399120^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 386353981 + ... + 386355643.

Almost surely, 2^642508052356 is an apocalyptic number.

642508052356 is the 801566-th square number.

It is an amenable number.

642508052356 is a deficient number, since it is larger than the sum of its proper divisors (487245259457).

642508052356 is an frugal number, since it uses more digits than its factorization.

642508052356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3812 (or 1906 counting only the distinct ones).

The product of its (nonzero) digits is 1728000, while the sum is 46.

The spelling of 642508052356 in words is "six hundred forty-two billion, five hundred eight million, fifty-two thousand, three hundred fifty-six".