642454550273 has 2 divisors, whose sum is σ = 642454550274. Its totient is φ = 642454550272.

The previous prime is 642454550233. The next prime is 642454550279. The reversal of 642454550273 is 372055454246.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 338272518544 + 304182031729 = 581612^2 + 551527^2 .

It is a cyclic number.

It is not a de Polignac number, because 642454550273 - 2⁶ = 642454550209 is a prime.

It is not a weakly prime, because it can be changed into another prime (642454550279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321227275136 + 321227275137.

It is an arithmetic number, because the mean of its divisors is an integer number (321227275137).

Almost surely, 2^642454550273 is an apocalyptic number.

It is an amenable number.

642454550273 is a deficient number, since it is larger than the sum of its proper divisors (1).

642454550273 is an equidigital number, since it uses as much as digits as its factorization.

642454550273 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032000, while the sum is 47.

The spelling of 642454550273 in words is "six hundred forty-two billion, four hundred fifty-four million, five hundred fifty thousand, two hundred seventy-three".