642081463 has 2 divisors, whose sum is σ = 642081464. Its totient is φ = 642081462.

The previous prime is 642081403. The next prime is 642081467. The reversal of 642081463 is 364180246.

642081463 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642081463 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642081467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321040731 + 321040732.

It is an arithmetic number, because the mean of its divisors is an integer number (321040732).

Almost surely, 2^642081463 is an apocalyptic number.

642081463 is a deficient number, since it is larger than the sum of its proper divisors (1).

642081463 is an equidigital number, since it uses as much as digits as its factorization.

642081463 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27648, while the sum is 34.

The square root of 642081463 is about 25339.3264117261. The cubic root of 642081463 is about 862.7071100475.

The spelling of 642081463 in words is "six hundred forty-two million, eighty-one thousand, four hundred sixty-three".