642053628851 has 2 divisors, whose sum is σ = 642053628852. Its totient is φ = 642053628850.

The previous prime is 642053628803. The next prime is 642053628859. The reversal of 642053628851 is 158826350246.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 642053628851 - 2²² = 642049434547 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 642053628851.

It is not a weakly prime, because it can be changed into another prime (642053628859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321026814425 + 321026814426.

It is an arithmetic number, because the mean of its divisors is an integer number (321026814426).

Almost surely, 2^642053628851 is an apocalyptic number.

642053628851 is a deficient number, since it is larger than the sum of its proper divisors (1).

642053628851 is an equidigital number, since it uses as much as digits as its factorization.

642053628851 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2764800, while the sum is 50.

The spelling of 642053628851 in words is "six hundred forty-two billion, fifty-three million, six hundred twenty-eight thousand, eight hundred fifty-one".