642380562101 has 2 divisors, whose sum is σ = 642380562102. Its totient is φ = 642380562100.

The previous prime is 642380562091. The next prime is 642380562133. The reversal of 642380562101 is 101265083246.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 642320499601 + 60062500 = 801449^2 + 7750^2 .

It is a cyclic number.

It is not a de Polignac number, because 642380562101 - 2²² = 642376367797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642380564101) by changing a digit.

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 as a sum of consecutive naturals, namely, 321190281050 + 321190281051.

It is an arithmetic number, because the mean of its divisors is an integer number (321190281051).

Almost surely, 2^642380562101 is an apocalyptic number.

It is an amenable number.

642380562101 is a deficient number, since it is larger than the sum of its proper divisors (1).

642380562101 is an equidigital number, since it uses as much as digits as its factorization.

642380562101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69120, while the sum is 38.

The spelling of 642380562101 in words is "six hundred forty-two billion, three hundred eighty million, five hundred sixty-two thousand, one hundred one".