642463455637 has 2 divisors, whose sum is σ = 642463455638. Its totient is φ = 642463455636.

The previous prime is 642463455509. The next prime is 642463455649. The reversal of 642463455637 is 736554364246.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 603404257681 + 39059197956 = 776791^2 + 197634^2 .

It is a cyclic number.

It is not a de Polignac number, because 642463455637 - 2⁷ = 642463455509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642463455037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321231727818 + 321231727819.

It is an arithmetic number, because the mean of its divisors is an integer number (321231727819).

Almost surely, 2^642463455637 is an apocalyptic number.

It is an amenable number.

642463455637 is a deficient number, since it is larger than the sum of its proper divisors (1).

642463455637 is an equidigital number, since it uses as much as digits as its factorization.

642463455637 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43545600, while the sum is 55.

The spelling of 642463455637 in words is "six hundred forty-two billion, four hundred sixty-three million, four hundred fifty-five thousand, six hundred thirty-seven".