642463455649 has 2 divisors, whose sum is σ = 642463455650. Its totient is φ = 642463455648.

The previous prime is 642463455637. The next prime is 642463455661. The reversal of 642463455649 is 946554364246.

642463455649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (642463455637) and next prime (642463455661).

It can be written as a sum of positive squares in only one way, i.e., 329467964049 + 312995491600 = 573993^2 + 559460^2 .

It is a cyclic number.

It is not a de Polignac number, because 642463455649 - 2³¹ = 640315972001 is a prime.

It is a super-2 number, since 2×642463455649² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 642463455593 and 642463455602.

It is not a weakly prime, because it can be changed into another prime (642463455679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321231727824 + 321231727825.

It is an arithmetic number, because the mean of its divisors is an integer number (321231727825).

Almost surely, 2^642463455649 is an apocalyptic number.

It is an amenable number.

642463455649 is a deficient number, since it is larger than the sum of its proper divisors (1).

642463455649 is an equidigital number, since it uses as much as digits as its factorization.

642463455649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 74649600, while the sum is 58.

The spelling of 642463455649 in words is "six hundred forty-two billion, four hundred sixty-three million, four hundred fifty-five thousand, six hundred forty-nine".