642204453461 has 2 divisors, whose sum is σ = 642204453462. Its totient is φ = 642204453460.

The previous prime is 642204453419. The next prime is 642204453497. The reversal of 642204453461 is 164354402246.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 618189062500 + 24015390961 = 786250^2 + 154969^2 .

It is a cyclic number.

It is not a de Polignac number, because 642204453461 - 2¹⁰ = 642204452437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642204453161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321102226730 + 321102226731.

It is an arithmetic number, because the mean of its divisors is an integer number (321102226731).

Almost surely, 2^642204453461 is an apocalyptic number.

It is an amenable number.

642204453461 is a deficient number, since it is larger than the sum of its proper divisors (1).

642204453461 is an equidigital number, since it uses as much as digits as its factorization.

642204453461 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 552960, while the sum is 41.

The spelling of 642204453461 in words is "six hundred forty-two billion, two hundred four million, four hundred fifty-three thousand, four hundred sixty-one".